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题型：单选题题类：常考题难易度：普通

Let's__________ and have a rest.

A、stop B、stopping C、stopped D、stops

举一反三

Nowadays scientists are working hard to find out ______ to do with air pollution.

Children are often warned ______ with fire.

Mount Xiaolei is not far away from here, but it will still take us a few hours there by bike.

I think she needs {#blank#}1{#/blank#}( practice ) speaking.

I'll ask him you back.

Jack promised{#blank#}1{#/blank#}(go) to the cinema with me together.

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