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The flu is believed ________ by viruses that like to reproduce in the cells inside the human nose and throat.

A. causing

B. being caused　　　

C. to be caused　　　

D. to have caused

It is normal for kids to feel anxious and not to be able to ______ their studies just before a quiz or an examination. Parents should try their best to help them relax within their power.

　　 A. settle down　 B. devote to　 C. get down for　 D. settle down to

Your suggestion ______________ good.

　 A. hears　　 　　　　B. sounds 　　　　 C. listens to　　 　　D. listens

To be honest, every season of the year I do ___________watching tulips in Tai zi wan garden.

A. pay attention to　　 B. look forward to　 C. do harm to　 D. play a trick on

_____ scores of times ,but he still couldn’t understand it .

A Having explained　　　　　　　　 B Having been explained

C Though it was explained　　　　　 D It was explained

You will be successful in the interview 　　　　 you have confidence.

A. before　　　　　　 B. once　　　　　　 　　 C. until　　　　　 D. though

Her eyes were full with tears.