--Is Bob still performing ?
--I’m afraid not . He is said the stage already as he has become an official.
| A．to have left | B．to leave | C．to have been left | D．to be left |
This is the bag ________ my mother bought yesterday．
| A．that | B．who | C．whom | D．this |
He made another wonderful discovery, _____ of great importance to science．
| A．which I think is | B．which I think it is | C．which I think it | D．I think which is |
Luckily, we'd brought a mad map without _______ we would have lost our way．
| A．it | B．that | C．this | D．which |
The boss ______ department Ms．King worked in ten years ago looked down upon women．
| A．in which | B．in that | C．whose | D．which |
He bought a book that could glee him much knowledge and ______ could help him to kill the time．
| A．that | B．where | C．which | D．there |