It was not until midnight      they reached the camp site.

A. that            B. when

C. while           D. as

Food prices are climbing around the world because farmers can't ____ demand for grain．

A．catch up with       B．keep up with          C．grow out of   D．put up with

I support your decision, but I should also make it clear that I am not going to be _____ to it.

　　A. connected    B. fastened    C. bound    D. stuck

Alice was very sorry to hear that her grandmother had _____ two days before.

　　A. broken off    B. passed off

　　C. given away    D. passed away

I remember her face but I cannot _____ where I met her.

　　A. recall    B. remind    C. remember    D. remark

While typing, Helen has a habit of stopping _____ to give her long and flowing hair a smooth.

　　A. occasionally    B. simultaneously

　　C. eventually      D. directly

These continual _____ in temperature make it impossible to decide what to wear.

　　A. alterations  B. vibrations C. waves   D. fluctuations

It is not enough only______the rules of grammar if you want to learn English well.

A. keeping in the mind          B. to keep in mind

C. to keep in your mind         D. keeping in your mind

— You _____ stop me.

— Even if you _____ it, I won’t allow you to do it.

A. mustn’t…dare not do  B. may…dare not do

C. can…dare to do        D. needn’t…dare do

If we____________, we can realize the progress we have made in space research.

A. turn back         B. look back       C. answer back       D. move back