12. D
13. A
14. B
15. A
16. D
17. C
18. A
19. B
20. C
1. My sister managed to finish her work though she was ill.
2. The test was very difficult; however, the students did it well.
3. Because she was careless, she broke the vase I liked best
4. People use energy- saving bulbs in order to save electricity
5. We got on a wrong bus so we were late for class.
6. I get access to the Internet so that I can communicate with my friends
7. I enjoy watching dangerous sports and game shows
8. We should do more grammar exercises so as to improve our English.
9. Because the man didn't relize that the traffic lights were red, so he didn't stop
10. People are getting weaker and weaker since the air is more and more polluted.
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II.
1. My sister managed to finish her work thoug she was ill
2. The test was difficult; however, the student did it well
3. She broke the vase I like best because she was careless
4. People use energy-saving bulbs in order to save electricity
5. We got on the wrong bus, so we were late for class
6. I get access to the Internet so that I can communicate with my friends
7. I enjoy watching dangerous sports and game shows
8. We should do more grammar exercises so as to improve our English
9. Because the red traffic lights isn't realized by him, he didn't stop
10. People are getting weaker and weaker since the air is more and more polluted
