Itneveroccurredtohumansuntilth

It never occurred to humans until the mid-1990s ______ some animals can be cloned.

A．where

B．that

C．when

D．what

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his composition was so confusing that I could hardly make any ____ of it.

A．meaning

B．message

C．information

D．sense

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we must ___ to the public the simple fact that drug are dangerous.

A．get across

B．get away

C．get back

D．get behind

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A．I realized

B．did I realize

C．I had realized

D．had I realized

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A．carry out

B．carrying out

C．carried out

D．to carry out

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This dictionary is _____ to me, but that one is _____ .

A．great help; helpful	B．a great help; of little use
C．important; of few importance	D．very helpful; of no any use

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