用动词的适当形式填空。

She ______________ (need) _______________ (wear) warm clothes because it is very cold outside.

用动词的适当形式填空。

It was difficult for us ____________ (decide) which road to take.

用下列单词的适当形式填空。

The _____________ (increase) population may be the greatest challenge of the world today.

用所给单词的适当形式填空

He's always sad when he thinks of his ________ (die) cat.

用所给单词的适当形式填空

At the ________ (begin) of the twentieth century, the world's population was 1.7 billion.

用所给单词的适当形式填空

We must have smaller families with fewer but ________ (health) children.

用所给单词的适当形式填空

There will be ________ (stand) room only on the earth in about 600 years.

用所给单词的适当形式填空

My father decided to give up ________ (smoke).

用括号内单词的适当形式填空。

Do you think you'll get the work _____________ (finish) on time?

用括号内单词的适当形式填空。

She spends much time _______________ (watch) television.