By the year she arrives in London, scientists probably ____ a cure for bird flue.
    A. will be discovering   B. are discovering    C. will have discovered    D. have discovered

___twice a year, whether it is a car or a bus or a truck, is the rule that every driver must obey in this city.
    A. Examining  B. Examined    C. Being examined   D. Having been examined

Your speech given at the meeting, _____ everyone is taking into careful consideration, means much to us all.  
    A. where         B. what         C. as        D. which

 —The work will take me another week. I’m really tired.
       —I think you          as well consult an experienced worker.
       A．may                    B．can                     C．need                   D．must

 New ideas sometimes have to wait a long time            .
    A. before fully accepted           B. before being fully accepted
    C. till are fully accepted         D. until being fully accepted

In area it is about the same size as the USA(without Alaska), which has         .

A. three times more than as many people   

B. as more than three times many people
    C. more than as three times many people    

D. more than three times as many people

 Was        Bill,        played the piano very well,        helped the blind man out?
     A. he; who; that     B. it; that; that           C. it; who; who      D. he; that; who

–Do remember to charge the battery 12 hours when you first use it.  --_________.
A. Made it     B. Got it     C. Understood it     D. Remembered it

 The ground is slippery. Hold on to the rope and don’t _________.
A. put off     B. turn up     C. let go     D. take apart

My English teacher insisted that the exercises ______ very difficult and that we ______ it carefully.
A. were; must finish    B. be; finish    C. were; finish    D. be; finished