The computer ________.

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A．is used for seek information

B．invented in 1976

C．is used to surfing internet

D．was invented in the USA

Yesterday, I saw Tina come to school ________.

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I've never forgotten ________.

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Could you tell me ________ the bike without any help this morning?

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－How many workers are there in your factory?

－There are two ________.

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The book was so interesting that he had read it for three hours ________ he realized it.

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－Is your mother at home?

－No. She ________ shopping.

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In the street I met the scientist ________ gave us a talk last week.

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He put on his coat and hat and then he________.

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As soon as he walked into the room, he ________ his heavy coat and sat down.

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