单项选择题

The tourist is forbidden to enter a country if he does not have a (an) ______ passport.

A．operative
B．valid
C．effective
D．efficient

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单项选择题

The Minister of Finance is believed ______ of imposing new taxes to raise extra revenue.

A．that he is thinking
B．to be thinking
C．that he is to think
D．to think

单项选择题

Scientists think ______ helps some trees to conserve water in winter.

A．when losing leaves
B．leaves are lost
C．that losing leaves
D．the leaves losing

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