Haveyoueverseenanytreesleavesw

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Have you ever seen any trees ________ leaves were black because of the polluted air?

A．whose	B．that
C．which	D．who

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As I grew up in a small town at the foot of a mountain, the visit to the village _____ scenes of my childhood.

A．called up	B．called for
C．called on	D．called in

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When it comes to my preference for entertainment in the spare time, I prefer gardening to parachuting, because the latter is a dangerous _____.

A．occupation	B．career
C．movement	D．devotion

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The reason why the government decided to put off the plans to build a new airport was that the plan met with fierce _____ from local farmers.

A．observation	B．argument
C．disagreement	D．opposition

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Having signed the agreement on the ceasefire, both sides have _____ it. In other words, neither of the two sides have broken the agreement so far.

A．ignored	B．assessed
C．obtained	D．observed

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As there is less coal and oil, scientists are exploring new ways of making use of _____ energy, such as sunlight, wind, and water for power and fuel.

A．primary	B．alternative
C．instant	D．unique

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