________ you work more efficiently are you able to catch up with others in the class.

A．Only when　 　　　　 B．Long before

C．Unless　 　　　　　　 D．Until

Susan's birthday party was ________ success. We sang and danced until it came to ________ end at ten.

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

Don’t be__________by products promising to make you lose weight quickly.

　 A. taken off　　　　　　　 B. taken out

　 C. taken away　　　　　　 D. taken in

—__________ Mr. White was appointed director of our department.

—Then we have two Whites now including ___________ Mr. White, the doorkeeper.

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

This book is said to be a special one, which ________many events not found on other history books.

　　A. writes　B. covers　　C. prints　　　　 D. reads

--Will $200 ___________?
--I'm afraid not. I need at least $100 more.
A. do          B. contain        C. include        D. cover

—How’s your new babysitter?

—We ______ ask for a better one. All our kids love her so much.

A. should 　　　 B. might 　　 C. mustn’t 　　　　 D. couldn’t

I _____ ten minutes to decide whether I should reject the offer.

A. gave 　 B. was given　　 C. was giving 　　 D. had given

在这个发达的国家里，你很少听到有人讲脏活。

You seldom hear rude words __________ in this ___________country.