The key to ________laws lies in devotion and responsibility of the staff concerned.

It doesn＇t alter the fact that he was the man _______ for the death of the little girl.

I suggest that he _______ it next week.

________ I remember, his writings always had the same meticulous descriptive quality.

I really don＇t know how to ______ the problem.

Investigations ______ the origin of life on the earth have shown that, given earth-like conditions, the formation of life is almost inevitable.

In the miserable days, his kind words gave me great ______.

In some families there is a _______ battle between the young and the old.

In Shenzhou VI, Chinese astronauts aren＇t only spaceship drivers, _______ machine repairers and scientists.

In recent years much more emphasis has been put ________ developing the students＇ productive skills.

In chemical factories, employees sometimes receive _______ pay for doing dangerous work.