What he lacks is more patience,___________?
| A．isn't it | B．is it | C．doesn't he | D．does he |
—Jane and July are here. Did I introduce them to you?
—No，you didn’t. I’ve seen them，but we__________.
| A．hadn’t been introduced |
| B．haven’t been introduced |
| C．weren’t introduced |
| D．didn’t introduce |
I can never forget the days _____ we worked together and the days ______ we spent happily together.
| A．when; which | B．which; when | C．for which; that | D．on which; when |
There are six boys and two girls in the classroom; that’s eight _______.
| A．at all | B．in all | C．after all | D．above all |
Who is that young woman ______ is standing over there?
| A．whom | B．that | C．which | D．who |
You should not go rafting ________ you know how to swim.
| A．if | B．if not | C．when | D．unless |