In spite of the great difficulties, Helen Keller ______ studying and finally succeeded.

The atmosphere of the earth ______ us from the strong sun light.

The fact that many college graduates get lower pay than some workers has ______ a heated discussion.

—Who telephoned you just now?
— don’t know. I was about to answer the phone when it ________.

The English in the future will be quite different from the English of today. It is possible that some English words may even ________ completely.

At a beach or a swimming pool a lifeguard is a person who is responsible for __________ other swimmers and protecting them from accidents.

Her valuable advice ________ to be taken, or you will suffer more loss.

Hearing the boring news, I was too distracted （心烦意乱）to        my attention on my homework.?

She is such an irritating woman, I don’t know how you can ______ her.

    Don’t let yourself be ______ into buying things you don’t really want.