—Mr Hu, can you tell us how to learn math well?—Sure. But remember nothing can be learned _________ hard work.
--Could you tell us __________ ? --About two weeks.
We have sent some books to the children in that village. However, they still need ______.
--Your coffee smells good! --It's from Canada. Would you like _________?
If you ________ a chance to study in a foreign country, just take it.
-When shall we start? ---Let's _______ it 8:30.Is that all right?