1 . The advantage is that ______ there is a new illness some of these animals may die, ______ others will survive and pass on the ability to resist that disease to the next generation.

A．while; and

B．if; but

C．whether; or

D．when; for

2 . If you __________ able to come, I will show you around my school.

A．can be

B．will be

C．will can

D．are

3 . Don’t ask other people’s advice ______ you intend to act on it.

A．if

B．unless

C．or

D．although

4 . We found that the habitat of polar bears is disappearing ________ the ice at the North Pole is getting warm.

A．because

B．because of

C．for

D．for which

5 . We will visit the Olympic Village ________ it rains tomorrow.

A．unless

B．as soon as

C．when

D．since

6 . — How do you like the concert given by the “Foxy Ladies”?
— Exciting, ________ one piece of the music wasn’t played quite well.

A．so

B．though

C．because

D．and

7 . 单句语法改错
1. The physics lesson is many more interesting than the geography lesson.
2. The   hard you work, the more you will get.
3. Third-fourths of the earth’s surface are water.
4. It is necessary of us to practise English a lot.
5. So far, they understood everything that the teacher’s said.
6. The sixteen-years-old girl lives in the countryside in the northwest of China.
7. How a ride it is! They are pleased to jump!
8. The driver would like to avoid punished because of the traffic accident.
9. I would rather stay at the countryside than to go to cities.
10. The house is divided to different rooms.
11. We were very impressed about our headmaster’s speech.
12. It is so a small kitchen that I don’t have to do much to keep it clean.
13. There are a number of people on the spot and the number of them are about 2000.
14. Pollution of the river could be rather worst than I think.
15. I think the party begins at six o'clock but I’ll call to make sure.