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题型：单选题题类：模拟题难易度：普通

——Some students often drop litter carelessly in our school. What can we do?
——We can _______ some signs to remind them not to do that again.

A、put up B、put off C、put away D、put on

举一反三

Bill doesn't like the sunglasses in the ad because they can't __________ the sun well.

If the customer rings up for me again, please the call to the sales department.

—Your socks are on the sofa.______, please, Tony.

—Yes, dad.

—____________of volunteers will be needed for the 2020 Olympic Games.

—Let's go and____________ them.

The heat turns water{#blank#}1{#/blank#} vapour. （填介词或副词）

This story in Beijing a long time ago.

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