theseexperimentsweresuccessful

________ these experiments were successfully completed would we think of going into humans.

A．If only

B．Only if

C．So that

D．Even if

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Now even the middle school students go abroad for study ___.

A．at their own expense	B．by expense their own	C．with their own’s expense
D．on expense of their own’s

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This dictionary is very useful. It has ___ many problems about words and idioms for me.

A．looked up

B．kept up

C．taken up

D．cleared up

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A．expense

B．sense

C．pay

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He is delighted to have ___ the examination.

A．got through

B．look through

C．seen through

D．passed through

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The carpet where he _____was warm and comfortable, so he slept soundly.

A．was laying

B．was lying

C．had laid

D．had lied

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