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When ______ comes to research into heart disease and its effects on the body, we do not have adequate substitutes for the use of animals.

A．that

B．it

C．this

D．what

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Though the Rockets has got Harward, ________ remains no possibility ________ it will get NBA championship next season.

A．it; that

B．it; which

C．there; whether

D．there; that

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It’s the test system rather than the teachers ________to blame for the students’ heavy burden nowadays.

A．who are

B．whom is

C．that is

D．that are

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Taking this kind of medicine, if ________, will do harm to health.

A．continue

B．continued

C．to continue

D．continuing

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—The hall___ for international conferences is of great importance
—I see, and we are sure to complete it on time

A．built	B．to be built
C．having been built	D．building

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Since Tom ___ downloaded a virus into his computer, he can not open the file now．

A．readily

B．horribly

C．accidentally

D．irregularly

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