The flood has caused ________ to the crops in the area.

[　　]

There are various ________ of birds in the world, but many have become extinct.

[　　]

The ________ of the school is quiet for the students are having a day off.

[　　]

He speaks English very fluently. He is ________ to have lived in America for some years.

[　　]

He has ________ a bad habit of biting his nail when he is thinking.

[　　]

The project got ________ after some days' delay.

[　　]

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 .

[　　]