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题型：单选题题类：常考题难易度：普通

四川省师范大学附属中学2017-2018学年九年级上学期英语Unit 7 Section B同步习题

Waste paper everywhere. It's our duty to keep the school clean.

A、throws B、are thrown C、shouldn't be thrown

举一反三

Don't put off today's work till tomorrow. I mean, today's work today.

Teenagers should {#blank#}1{#/blank#}（教育）to keep away from danger.

We should keep bananas in a cool place before they go bad. (改为被动语态)

My grandmother is ill. The doctor must{#blank#}1{#/blank#} (send) for at once

It must {#blank#}1{#/blank#} (treat) well for our children and for our children's children, too!

Short-term memory can hold about seven items of information at a time. (改为被动语态)

About seven items of information can {#blank#}1{#/blank#} {#blank#}2{#/blank#}at a time by short-term memory.

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