_____, I think, and the problems could be settled.

A. If you double your efforts

B. So long as you keep up your spirits

C. Making greater efforts

D. A bit more efforts

— Is this Mr. White’s office, Mary?

— Yes, _____.

A. that’s all right         B. it doesn’t matter

C. after you                 D. please yourself

—What should we pay more attention to if we go north in winter, Mum?

—Nothing much. Take warm clothes________ the weather is cold.

A. as long as      B. now that  C. if              D. in case

All of us still remember the terrible earthquake that _______Tangshan twenty years ago.

A. attacked     B. struck  C. knocked      D. exploded

Scientists say they have found a way to produce the human body’s own cancer-killing cells through gene treatment, ____ new hope to cancer sufferers.

A、offering B、showing  C、taking   D、making

It is thought that one billion people I the world,________is half the word’s workers, earn their living by farming.

A. if    B. that    C. which   D. what

He wishes to make friends with ____ shares his hobbies and interests.

A. whoever         B. no matter who       C. whoever         D. anyone

Smallpox, a kind of disease, has now died ________.

A. out        B. away  C. off         D. down

—_______is the best football player in your city?

   —Jerry.

A. Do you think who     B. Do you think whom

C. Who do you think     D. Whom do you think

The president stood by a window inside the room, ____, looking over the square.

A、where I entered  B、into which I entered

    C、which I entered  D、that I entered