In the United States，there is always　　　 flow of people to areas of　　　 country

where more jobs can be found.

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

_____ good, these cookies sell well.

A.Smelled　 B. Smelling　　 C. Being smelled　　　 D. To smell

—I’ve studied growing plants as one of my interests. Could I make some suggestions?

— ______.

A. You will make it　 　 B. Go right ahead.　 　　　C. Don’t mention it　　　 D. Take it easy

This is the small house less than 15 square meters, under ______ roof lives a large family of three generations.

A. which　 　 B. that　　　 　 C. its　　 D. whose

____ all the students go out for play.

A. Not　　　　　　　 B. No　　　　 C.不填　　　　 D.none of

—How should I pay you?

—Either ________ cheque or ________ cash.

A. by; by　 B. by; in　 C. in; in　 D. in; by