—Do you know the man __________ is talking with your father?
—Yes, he's our headmaster.
| A．he |
| B．who |
| C．which |
| D．whom |
---May I smoke here?
---If you _______, choose a seat in the smoking section.
| A．should | B．could | C．may | D．must |
---Do you mind if I open the window?
--- _____. In fact, I feel a little hot as well.
| A．Please don’t | B．I’d rather you didn’t | C．Go ahead | D．Why don’t? |
many times, but he still didn’t understand it.
| A．Having been told | B．Though he was told |
| C．To have been told | D．He was told |
—What does this modern-day dinosaur look like?
—The tongue of this animal can be extended _____ of its body.
| A．more than twice the length | B．twice more than the length |
| C．more than the length twice | D．more twice than the length |
The World Wide Web is sometimes jokingly called the World Wide Wait because it_______ be very slow.
| A．should | B．must | C．can | D．will |