I think you should go back to your ______ plan, which is much more practical than the present one.
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.