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_____is a question scientists have yet to answer.

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Because of the rain, people are calling to ask_____ take place.

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_____ will it strike? In twenty minutes’ time.

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 _____ do you find it? Beautiful.

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I haven’t got a passport, ____ means I can’t leave my country.

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“Do you know Don Kline?”

          “I remember the name but I can’t remember_____”?

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The year____ he died was full of calamities.

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A majority of the TOEFL tests ______ difficult.

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It was the time____ I had a lot of toys.

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The people at the party were worried about Janet because no one was aware_____ she had gone.

Choose the letter A, B, C or D to complete the sentence: Ha Long Bay is one of the seven ____________ of the world.

Choose the letter A, B, C or D to complete the sentences:

We haven’t known who __________ the pyramid yet.

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The house____ which I am living is not in very good condition.

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Two-thirds of the money______ mine now.

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The teacher____ house is next to mine died this morning.

In order not to get lost, we need a ____________.

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Take____ measures you consider best.

Choose the letter A, B, C or D to complete the sentences:
It is __________  and the oldest one among the three pyramids of the Giza Pyramid Complex.

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My old friends and colleague, John, _____ married.

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The land and the people______ I have met are nice.

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His choice of words______ very good.