Howmanymoredecadeswillhavetopa

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How many more decades will have to pass ____ scientists succeed in providing a cure for cancer?

A．when

B．since

C．before

D．until

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---How long has the United Nations ________?
--- ______1945.

A．come into existence; In	B．been in existence; Since
C．been in existence; From	D．come into existence; For

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Dr. Black is a professor of chemistry. _______, he is a famous writer.

A．In all

B．In brief

C．In fact

D．In addition

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The new invention may __________a lot of changes in our daily life.

A．result from

B．expose to

C．lead in

D．contribute to

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It _______ them three years to build this road.

A．spent

B．took

C．spend

D．paid

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I wanted _______ you for your last letter.

A．thanking

B．to thank

C．thank to

D．being thank

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