They _____ the house for 3,000 pounds.

[　　]

A. paid　　　B. spent

C. cost　　　D. bought

He’s ______ his life writing this book.

[　　]

A. paid　　　　B. lost

C. spent　　　 D. wasted

The clouds are _____. It's going to rain.

[　　]

A. moving　　　　B. picking

C. watering　　　D. gathering

You must _____ or you will not get there in time.

[　　]

A. speed　　　　B. speed up

C. speed of　　 D. speed down

Carelessness is the ________ of home accidents.

[　　]

The flowers have died for ________ of water.

[　　]

We like to ________ your school activities from time to time.

[　　]

His rich experience ________ his lack of knowledge in the area .

[　　]

What a ________ it is that you haven't passed the English exam !

[　　]

Choose the word or expression which is closest in meaning to the underlined part(选择与划线部分意义最相近的词语)：

Things will soon return to normal.

[　　]

A.usual　　　　B.usual state

C.regular　　　D.average