Howlongdoyouthinkitwillbescien

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How long do you think it will be _______ scientists succeed in providing a cure for cancer?

A．when

B．after

C．since

D．before

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Check your homework to avoid ______ mistakes again.

A．make

B．making

C．to make

D．made

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First of all, please _____ me to introduce myself to you．

A．make

B．agree

C．let

D．allow

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He didn’t catch the first train. That’s ____ he didn’t attend the meeting.

A．because

B．how

C．why

D．when

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He is ____ to come here tomorrow if he can finish his work on time.

A．possible

B．probable

C．likely

D．alike

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When she saw the ______ tiger, her face turned pale ______.

A．frightening; with fear	B．frightened; with fear
C．frightening; at fear	D．frightened; at fear

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