—How far can you run without stopping?
—_________. I’ve never tried.
| A．Don’t mention it. | B．That’s all right. |
| C．I have no idea. | D．Go ahead. |
--When did you become a volunteer for the elderly?
-- Two years ago. I this group since then.
| A．joined | B．took part in |
| C．have joined | D．have been in |
He met many problems he was going over his lessons.
| A．before | B．as soon as |
| C．since | D．while |
--Where does your uncle work, Tom ?
--He is in a hospital he works as a doctor.
| A．that | B．which | C．where | D．what |
In our school library there a number of books on science and the number of them growing larger and larger.
| A．is , are | B．are , is | C．has , is | D．have , are |
A lot of traffic was kept from going into the city centre the heavy snow?
| A．because of | B．thanks to |
| C．thanks for | D．with the help of |