The reason we are so late is ________ .

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A．because of the car breaking down

B．due to the car breaking down

C．because the car broke down

D．that the car broke down

I was about to go out ________ the bell rang．

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Someone is ringing the doorbell. Go and see ________ .

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________ made the school proud was ________ more than 90％ of the students had been admitted to key universities.

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

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The other day, my brother drove his car down the street at ________ I thought as a dangerous speed.

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He advised that the doctor ________ .

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I wonder ________ Jenny hasn't written us recently. We should have heard from her by now.

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I wonder whether he knows ________ to write a book.

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Whether we will go there depends on ________ it will be fine or not.

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