20. Scientists have many theories about how the universe ___ into being.

A. would come　　 B. was coming　　　 C. had come　　　　 D. came

19. Obama was elected _____ president last year, who is _____ first black president of ______ U. S. A.

A. /; a; the　　 B. /; the; the　　 C. the; a; /　　 D. the; the; /

18. -----Was it under the tree 　　　　you laid your bike when away posting the letter in the post office?

-----Sure. But when I got back, it was gone. It’s a gift bike from my parents.

A．that　　　 　　 B．where　　 　　 C．While　　 　 D．which

17. Many Chinese universities provided scholarships for students ______ financial aid.

A. in favor of　　　 B. in honor of　　　 C. in face of　　　 D. in need of

16. -Would you like to join me for a quick lunch before class?

-______, but I promised Nancy to go out with her.

A. I’d like to　　　　 B. I like it　　　　　　　　　　 C. I don’t　 　 　　　 D. I will