Whencomestoresearchintoheartdi

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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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—I prefer shutting myself in and listening to music all day on Sundays．
—That's _____ I don't agree．You should have a more active life．

A．where

B．how

C．when

D．what

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Our school called on us to donate our pocket money to the school damaged by the flood, _____ the students to return to their classrooms．

A．enabling	B．having enabled
C．enable	D．to have enabled

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All we are required to do ______ record a "weike" where we explain what we think students are puzzled about．

A．are

B．is

C．was

D．were

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It's not the score you've got, but the attitude you choose ______ determines our evaluation of your work．

A．which

B．that

C．what

D．who

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So sudden_____ that the enemy had no time to escape．

A．did the attack	B．the attack did
C．was the attack	D．the attack was

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