Don't drink ________ water before dinner.

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When the father came home, the naughty boy pretended ________ his homework.

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When we talk about the computer, he pretended ________ an expert.

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--What is behind that tree?

--There must be a dog ________ beside it.

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--Look! What's the man doing?

--He stopped his car by the road. He ________ it.

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The little boy tried ________ the pencil on the table. But he failed.

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If you have ________ where my lost book is, please get it back to me.

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Lucy is the only student ________ comes from the USA.

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--Who broke the window?

--It ________ Timmy. He likes to throw things here and there.

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The house ________ our family for over fifty years now.

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