How long do you suppose it is ___________ he arrived there?
| A．when | B．before | C．after | D．since |
—There will be a(n)________football match between China and Brazil on TV tonight.
—What time? I can't wait for it.
| A．live |
| B．living |
| C．lively |
| D．alive |
I would appreciate it________you call back this afternoon for the doctor's appointment.
| A．until |
| B．if |
| C．when |
| D．that |
________much advice I gave him, he did exactly what he wanted to do.
| A．How |
| B．Whatever |
| C．However |
| D．No matter |
The research is so designed that once________nothing can be done to change it.
| A．begins |
| B．having begun |
| C．beginning |
| D．begun |
Visitors________not to touch the exhibits.
| A．will request |
| B．request |
| C．are requesting |
| D．are requested |