It was with great joy ________ he received the news ________ his lost son would soon return home.

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It's a common belief ________ teenagers today know about computers and are familiar ________ using them in all aspects of life.

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The thought ________ he would go to Beijing by himself surprised his parents.

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There is a new problem involved in the popularity of private cars ________ road conditions need ________.

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Rather than ________ on a crowded bus, he always prefers ________ a bicycle.

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The reason ________ he was late was ________ his car had broken down on the way.

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If water shortage weren't ________ problem in the area, there wouldn't be a need for ________ college graduates.

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While shopping, people sometimes can't help ________ into buying something they don't really need.

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--Can I go to the beach with my classmates this afternoon, Mum?

--You can go where you like ________ you get back before supper.

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Although ________ happened in that developed country sounds like science fiction, it could occur elsewhere in the world.

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