(   ) 7. Mr. Green speaks very loudly       all the people can hear him clearly.

    A. so that   B. when

   C. because   D. in order to

(   ) 6. Because 1 got up very late this morning,      I was late for class.

    A. but   B./

   C. so   D. because 

(   ) 5. The box was too heavy for me to carry,       I pulled it into my room.

    A. so   B. and

   C. but   D. or

(   ) 4. [2013 •上海〗I hate traveling by air       you usually have to wait for

hours before the plane takes off.

   A. because   B. though

   C. until   D. unless

(   ) 3. They develop their skills           they can do things better and better.

    A. however   B. because

   C. since   D. so that

(   ) 2. [20M .天津]It was raining heavily,    we decided to stay at home and watch TV.

    A. but   B. or

   C. because   D. so 

(   ) 1. Mr. Smith is popular with the students        he always makes his class inter- esting,

    A. until   B. while

   C. because   D. although

 Modern industry is developing faster and faster,and many fields,rivers and mountains have been1. p     , We all need a healthy environment,so it's 2. n        for us to think about it. When shopping we should take our own cloth bags 3. i      of using plastic bags. If it isn't too hot,don't turn on the air conditioner because it wastes energy. Sort the waste before 4. t        it away. If you do these,you can make a 5. d        to the environment.

 I can't remember when I started collecting lit- ter. But it was when I got tired of 1.       (see) litter nearby and realised that no one else 2.     (be) going to pick it up.

  I live near a forest in Ohio,America. I can walk there in three minutes!I used to love going there 3.     (play) with my dog. But one day there was so much litter there that I became very unhappy. I decided I had to clean up the forest, and I wanted to feel happy going there again. I made my first trip to clean the forest that afternoon. I took a big black rubbish bag with me. Ten minutes later my bag was 4.        (fill) with litter!There were cans,bottles,broken glass and newspapers in it.

  From then on,I go to the forest four times a month 5.        (pick) up litter. I'm often there for three hours. It makes me 6.        (feel)

great to do something for the environment. After each trip,I look at all the litter that I've found. If any of it is 7     (recycle) , I keep it. I can't understand why people drop litter. But I will keep 8.      (pick) it up until people stop9.    (drop) it. I know I'm only doing a small bit 10.        (help) the earth,but I still think it's important.

 It's very important that we all recycle. In na?ture,everything 1        again. For example,when an animal dies,it becomes 2        animal's food. Nothing is wasted. But humans have created things like plastic bags which can't be 3        down by nature. Our 4        kills animals and pollutes water and soil.5 we continue making too much rub?bish,the problem will only get worse. If nature can't reuse the rubbish,we must recycle 6        We should clean up the rubbish we've made because na?ture can't.

  Recycling is also the right thing to do for another reason. The earth is rich in natural materials like water and trees,7        these materials are not end-less (无尽的) ，We use up our natural materials 8        faster than the earth is able to reproduce (再生) them. For example* each year we cut 9        more than 6        ,000 square miles of forest. But it takes an average of 25 years for a new tree 10     .

  Recycling can help us save the earth,so let's take action right now.

(   ) 1. A. use   B. is used

   C. used   D. to use

(   ) 2. A. another   B. others

   C. the other   D. the others

(   ) 3. A. lain   B. broken

   C. put   D. pull

(   ) 4. A. rubbish   B. nature

   C. material   D. pollute

(   ) 5. A. When   B. Why

   C. If   D. Unless

(   ) 6. A. them   B. it

   C. itself   D. themselves

(   ) 7. A. but   B. so

   C. and   D. although

(   ) 8. A. very   B. more

   C. much   D. many

(   ) 9. A. out   B. down

   C. up   D. off

(   ) 10. A. grows   B. growing   C. to grow   D. grown