（上海卷34）. you may have, you should gather your courage to face the challenge.
| A．However a serious problem | B．What a serious problem |
| C．However serious a problem | D．What serious a problem |
—What do you think of teaching，Bob?
—I find it fun and challenging.It is a job ________ you are doing something serious but interesting.
| A．where | B．which | C．when | D．that |
The weather turned out to be very good，________ was more than we could expect.
| A．what | B．which | C．that | D．it |
Is this the factory ________ he worked ten years ago?
| A．that | B．where | C．which | D．the one |
Alice received an invitation from her boss，________ came as a surprise.
| A．it | B．that | C．which | D．he |
I have bought two ballpens，________ writes well.
| A．none of them | B．neither of them |
| C．neither of which | D．none of which |