用合适的短语填空。

The look on his face is a sign that he is ________ his son’s safety.

用合适的短语填空。

His car knocked into an old man who was walking ________ slow ________.

用合适的短语填空。

What a pity I ________ on the last problem, or I would have got a full mark.

It is not easy for so old a lady to ____ ____ a new environment.

It’s polite to ____ ____ when you ask your teacher a question in class.

He is generous, so it is ____ 　　   ____ time, not of money.

The real ________ (尊严) of a man lies in what he is, not in what he has.

The beginner did a good job under the ________ (指导) of his coach.

He loses his temper ____ 　　   ____, but not often.

In recent years, a new ________ (现象) in China is the rapid increase of young smokers, especially young girls.