No sooner ________ he realized that he left the key in the room.

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A．had Tom locked the door then

B．had Tom locked the door than

C．had Tom locked the door when

D．Tom locked the door than

Hardly ________ my mail box ________ I found an E-mail from my teacher.

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I was about to leave my house ___ there was a knock at the door.

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I am to stay ________.

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________ he stayed in the country, he collected a lot of folktales.

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It was nearly mid-night ________ Henry began to feel terrible.

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________ the day goes on, the weather gets colder and colder.

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We walked 5 Li ________ we arrived at his cottage.

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No matter ________ the conditions were like, we think that a car should be driven as fast as it could.

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________ books you read, ________ you will feel.

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