He didn't like the work because it lacked ________; he was doing the same things all the time.

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－Look, it ________ be Lao Wang.

－No, it ________ be him. He has gone abroad.

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You ________ walk for miles and miles among the hills without meeting anyone.

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Teenagers would rather tell their close friends about ________ is troubling them.

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Her daughter is always shy in ________ and she never dares to make a speech to ________.

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John ________ to understand why the plan had failed.

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________ the advent of the rockets, the Space Age began.

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He worked very hard and the result of the exam ________ to be the best in the class.

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Bora Milutinovic, China's Yugoslav (南斯拉夫) head coach, replaced Shen Si and Li Ming and the change began to ________ in the following matches.

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Being able to speak another language is a great ________ when you are looking for a job.

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