Nuclear power will___our health and safety if improperly used
is more important isas the earth cooled down, water began to appear on its surface.
life will continue on the earth for millions of years to come will depend onthe problem of pollution can be solved.
The factLucy has been admitted into Lanzhou university made us excited.
You and I could hardly work together, ______?
----What did the young man come to your company for? --- He wanted a job, _______could help him support his family.