______ the Great Green Wall, the land produces (生产出) more crops.
[     ]
A. Thanks for
B. Thanks to
C. Thank to
D. Thank for
—Is the flower beautiful?
—Yes, at _____ it's _____ the one you bought for me.
[     ]
A. last; as bad as
B. least; no better than
C. last; not better
D. least; no worse than
_____, I have to write the words on the paper because she doesn't know Chinese.
[     ]
A. Sometime
B. Once in a while
C. After a while
D. For a while
—Have you been to your hometown this year?
—Yes, and it has changed a lot ________.
[     ]
A. last year
B. in the last few years
C. that year
D. in the next year
He is sitting _____ the classroom.
[     ]
A. at the front
B. in the front
C. in front
D. in front of
The house is behind the tree. So the tree is _____ the house.
[     ]
A. at the back of
B. under
C. in front of
D. on
The post office is near here. You can go there _____ foot.
You don't need to go there _____ a bike.
[     ]

A. on; by
B. on; on
C. by; ride
D. on; ride

Swimming is good for our health, but ______ the same time we mustn't forget the danger.
[     ]

A. in
B. at
C. on
D. for

Which of the following sentences is wrong?

[     ]

A. When he was five, he had to look after his sister.
B. At the age of fifteen years old, he left school.
C. He won a gold medal at the last Olympic Games.
D. The boy doesn't play computer games anymore.
Look! Mrs. Green is talking ____ the students of ClassⅠon the ground.
[     ]
A. among
B. in the middle of
C. between
D. at
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