31. I just wonder ____ that delights the whole family so much.
| A．what it is | B．what he does | C．how it is | D．how he does |
--I left my handbag on the train, but luckily someone gave it to a railway official.
--How unbelievable to get it back! I mean, someone it.
| A．will have stolen | B．might have stolen | C．should have stolen | D．must have stolen |
---Any advice for me?
---You’d better the timetable to see when the train leaves.
| A．consult | B．recommend | C．remind | D．request |
If traffic moves at low speeds, the number of accidents is.
| A．pulled back | B．cut down | C．turned down | D．got away |
—Who______ it be that is knocking at the door? —It ______ be Father, but I’m not sure.
| A．can; must | B．can; may | C．must; can | D．may; must |
---Do you mind if I keep pets in this building?
--- _________.
| A．Of course not. It’s not allowed here. | B．I’d rather you didn’t, actually |
| C．Great! I love pets. | D．No, you can’t. |