Maybe you could be an inventor—maybe even good enough to _____ the next iPhone or the new medicine for cancer．
| A．put up with | B．keep up with | C．catch up with | D．come up with |
After living in Pairs for fifty years he returned to the small town ____ he grew up as a child.
| A．which | B．where | C．that | D．when |
Carol said the work would be done by October, ＿＿＿＿＿personally I doubt very much.
| A．it | B．that | C．when | D．which |
He was hiding behind the door _________ he could see what was happening.
A. whichB. from whereC from which D. where
Recently I bought an ancient Chinese vase, _____ was very reasonable.
| A．which price | B．the price of which |
| C．its price | D．the price of whose |
_____ has already been pointed out, grammar is not a set of dead rules.
| A．As | B．It | C．That | D．Which |