is known to us all is the old scientist, for whom life was hard in the past, still works very hard in his eighties.
Could you drive me to the bookstore at noon if________? A. it’s convenient of you B. it’s convenient to you C you are convenient D. you will be convenient
Children should be taught at an early age to keep ______even in a difficult situation.
What great trouble we had _________ where his house was.
--Shall I open the window? --I’d rather _________.
_____ to strong sunlight for a long time will do harm to your skin.