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题型：单选题题类：常考题难易度：普通

Look! David is helping his mother _______ the room.

A、is cleaning B、cleaning C、cleans D、clean

举一反三

We noticed our new teacher ________ into the dining hall.

Mrs. Zhang is all her time and energy being a mum right now.

Everyone is born ______ the ability to learn.

Hello! Nice to m{#blank#}1{#/blank#} you.

Look at the sign "No{#blank#}1{#/blank#}(park) ". Could you please drive your car away?

Running is good {#blank#}1{#/blank#} our health and it costs nothing.

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