. In my opinion, this is not an economical way to get more water; ____, it is very expensive.
| A．on the other hand | B．on the contrary | C．in short | D．or else |
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 |
He lived in London for 3 months, during ____ time he learned some English.
| A．this | B．which | C．that | D．same |