9. There is air _______ water on the moon.

A. and　　　 　B. or　　　　　 C. so　　 　　　　D. yet

8. The computer cost me too much, _______ it’s really useful.　

A. so　　　　 B. but　　　　　 C. and　　　　　 D. or

7. I can’t understand this passage _______ there are no new words in it.

A. if　　　　　　　 B. because　　　　　　 C. though　　　　　　　　　　 D. an

6. Which is nearer to us, the sun _______ the moon?

A.　but　　　　　　 B. and　　　　　　 C. or　　　　　　 D. so

5. My aunt doesn't have much money, _________ she always enjoys himself.

A. but 　　　　　B. and　　　　 C. or　　　 D. so

4. Mr. Green knows little German, _________ he can't understand the instructions on the bottle of the pills.

　A. but 　　　　　B. so　　　　 C. for　　　　 D. or

3. Lucy and Lily are twins. Lucy likes playing table tennis, _________ Lily doesn't.

　A. or　　　　　 B. but　　　　 C. and　　　 D. yet

2. Edison said, “Never give up, _________ you'll make it.”

A. yet　　　　 B. or 　　　　C. and 　　　D. but

1. Be careful, _________ you will fall off the bike.

A. but　　　　 B. and　　　　 C. so 　　　　D. or

5.　　　 He had a drink, _______ went to bed.