China is developing fast. That's ________ I think those of my colleagues who deal with China affairs should visit China.

The old woman is warm­hearted. She is always ready to help ________ is in trouble.

After a day's exhausting climb we arrived at ________ we had been told was “Garden in the Air”．

I think you should work harder ________ you are satisfied with the way things are.

．Ram explained to his mother ________ he would get home late that night because of extra work.

Air pollution is getting more and more serious, so we must take action ________ it is too late.

Doctor Smith has made another wonderful discovery, _______ great importance.

Thinking________you know _________in fact you don’t is a terrible mistake.

       is widely acknowledged that      there is life, there is hope.     

–Tom seems not so enthusiastic as he was two years ago.
--Yes. He’s reached a point in his career_________ he has to decide what to do next.