Bytheyear2020scientistsalotofr

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By the year 2020 scientists _____ a lot of research on AIDS.

A．had done

B．do

C．are doing

D．will have done

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This is the store ______ we visited the famous shop assistants.

A．where

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C．that

D．which

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The gentleman ______ you told me yesterday proved to be a thief.

A．who

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It was ______ computer games that cost the boy a lot of time that he ought to have spent on his lessons.

A．to have played	B．playing
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______ a reply, he decided to write again.

A．Not receiving	B．Receiving not
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The first textbooks ______ for teaching English as a foreign language came out in the 16th century.

A．having written	B．to be written
C．being written	D．written

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