Tom is a boy of fifteen. His parents 1______(die) two years ago, and he had to make a living by himself.
Now he 2______(work) as a servant at Mr. Jackson's. He works hard and Mr. Jackson is pleased with him.
     Mr. Jackson has fun 3______(plant) all kinds of trees. There are many kinds of precious (珍贵的)
trees in his garden. The week before last Mr. Jackson 4______(bring) a few trees home, planted them in
the garden himself and watered them every day. Some days later, he had to 5______(leave) for another city.
Before he started, he said to Tom,
     "6______(take) good care of the plants when I am out. Some boys of our neighbors always want 7______
(steal) them."
     "8______(not worry) about them, sir," answered Tom."I 9______(try) my best to watch them."
    Six days passed and Mr. Jackson came back. As soon as he saw Tom, he asked,"10______ anyone ______
(come) to steal the trees?""No, sir," said Tom."I pulled them six days ago. Now they have been hidden (藏起来)
in the house for nearly a week!"

     In many countries, 1_____(smoke) is becoming a bigger problem for young people. Most smokers
2_____  (start) in their teens (years of a person's age from 13 to 19 ) or even earlier.
     A study of 8,000 Beijing students last May 3_____(show) us that smoking was a problem for many
Chinese kids. More than 21% of middle school students and 6% of primary school pupils(小学生)
said they had smoked.
     "If young people start 4_____(smoke) early, they will probably get addicted to nicotine
(对尼古丁瘾).And it 5_____  (be) very hard to give up弃) later on," said a professor.
     Every year, about 4 million(百万) people die (死亡) of smoking. And if people keep 6_____
(smoke), that number will go up to about 10 million a year by 2030, the World Health Organization
(WHO, 世界卫生组织) says. So we have to 7_____(know) and tell others about the dangers(危险)
of smoking. Everyone of us should 8_____(do) something useful to stop kids from 9_____(smoke),
or one day we 10_____(see) what we won't see.

       In many countries,   1   (smoke) is becoming a bigger problem for young people. Most smokers
  2   (start) in their teens (years of a person's age from 13 to 19 ) or even earlier.
       A study of 8,000 Beijing students last May   3   (show) us that smoking was a problem for many
Chinese kids. More than 21% of middle school students and 6% of primary school pupils (小学生) said
they had smoked. "If young people start    4  (smoke) early, they will probably get addicted to nicotine
(对尼古丁瘾).And it   5  (be) very hard to give up弃) later on," said a professor.
       Every year, about 4 million (百万) people die (死亡) of smoking. And if people keep   6   (smoke),
that number will go up to about 10 million a year by 2030, the World Health Organization (WHO, 世界卫
生组织) says. So we have to   7   (know) and tell others about the dangers (危险) of smoking. Everyone
of us should    8   (do) something useful to stop kids from   9   (smoke), or one day we   10   (see) what
we won't see.

     In many countries, 1_________ (smoke) is becoming a bigger problem for young people. Most
smokers 2_________ (start) in their teens (years of a person's age from 13 to 19) or even earlier.
     A study of 8,000 Beijing students last May 3_________ (show) us that smoking was a problem
for many Chinese kids. More than 21% of middle school students and 6% of primary school pupils
(小学生) said they had smoked.
     "If young people start 4_________ (smoke) early, they will probably get addicted to nicotine
(对尼古丁瘾). And it 5__________ (be) very hard to give up (放弃) later on," said a professor.
     Every year, about 4 million (百万) people die (死亡) of smoking. And if people keep 6_________
(smoke), that number will go up to about 10 million a year by 2030, the World Health Organization
(WHO, 世界卫生组织) says. So we have to 7_________ (know) and tell others about the dangers
(危险) of smoking. Everyone of us should 8_________ (do) something useful to stop kids from 
9_________ (smoke), or one day we 10_________ (see) what we won't see.
1._______ 2._______ 3._______ 4._______ 5._______
6._______ 7._______ 8._______ 9._______ 10._______

1. She stopped ________ (sneeze) after she saw a doctor.
2. When did she ________ ( become) a teacher?
3. Tiger Woods started golfing when he ________ (be) ten months old.
4. You are too young ________ (go) to school.
5. She started ________ (hiccup) in 1990.
6. Jordan ________ (be) born in 1975.
7. Linda, with a lot of flowers, ________ (come) from Beijing.
8. He wants ________ (become) a film star when he grows up.
9. She ________ (can) count from 1 to 100 when she was four years old.
10. She learned ________ (ride) a bike from her father many years ago.

1. I ___________ (be) learning English for five years since I was ten years old.
2. If I don't study hard, I ___________ (not pass) the final exam.
3. I ___________ (study) for my exam when my friend called to invite me to the movies.
4. We ___________ (have) so many exams this year that I am sick of them.
5. It ___________ (be) a nice day yesterday, wasn't it?
6. It's now four o'clock, so we ___________ (be) skating for about two hours.
7. I ___________ (go) to school early today.
8. My friend ___________ (collect) shells as a hobby.
9. We are going to the beach tomorrow, ___________ (be) we?
10. My brother ___________ (be) playing the piano since he was ten.

1. _____ you _____ (read) this story book before?
2. My mother _____ (go) out .She 's doing shopping in town.
3. The car doesn't move. What _____ I _____ (do)?
4. It was seven in the morning and Li Ping _____(have)some reading at his desk.
5. Let's run and seen who _____ (get) to the finishing line first.
6. Little Tom _____(draw) every evening after supper but he _____ (not draw)
at the moment.
7. "Listen! Who_____ (sing) in the next room?" "Maybe it is Wang Lin. She likes
_____ (sing) a lot."
8. Lucy _____ (not finish) her work yet. She _____ (do) it now. I _____ (be)
sure she _____ (finish) it soon. After she _____ (finish) it ,we _____ (go)
swimming together.
9. The story_____ (happen) many years ago.
10. At night we can always see him _____ (study) in the room .