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The second reason ________ he gave the teacher for his being late for school sounded reasonable.

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We'll put off the outing until next week ________ we don't be so busy.

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The reason ________ nothing on earth is motionless is that the earth is in constant motion.

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I'll never forget the day ________ I was sent abroad to study science.

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This is the first time ________ he has been here.

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Is this the restaurant ________ you work in?

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Africa is actually connected with Asia at the spot ________ the Suez Canal was dug.

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He couldn't earn enough money ________(keep) a family.

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The girl was frightened by the thief and stood there without ________(dare) to speak.

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The pen I thought I ________(lose) is on my desk.