—Have you known each other for long?
—Not very long, __________ we started to work in the company.
| A．after | B．before | C．when | D．since |
It is a wise father ________ knows his child.
| A．that | B．which | C．what | D．whom |
—May I smoke here?
—Choose a seat in the smoking section, if you ________.
| A．should | B．must | C．can | D．may |
---Would you like to go out for a walk?
----．
| A．No,but I can’t afford the time |
| B．No,I don’t feel in the mood for it now |
| C．You may ask your sister to go,too |
| D．No,thank you |
As a result of the serious flood,two-thirds of the buildings in the areas．
| A．need repairing | B．need to repair |
| C．needs repairing | D．needs to repair |
All of the children ______ in the school play and they are in high spirits.
| A．are involving | B．involve |
| C．are involved | D．have involved |