I couldn't have got to the meeting on time - _______ an earlier train .
| A．if I had not caught | B．unless I had caught | C．if I did not catch | D．unless I caught |
Don’t leave the water ______ while you brush your teeth.
| A．run | B．running | C．being run | D．to run |
He will _______ his uncle’s business when he is mature(成熟的) enough to deal with the public relations.
| A．hand over | B．take over | C．think over | D．go over |
-- Why do you walk so strangely?
--- This is ______ I fell over myself accidently yesterday and my left leg got hurt.
| A．why | B．because | C．want | D．where |
----Where can I stay at noon, Sir?
----It depends. You can stay ____in the classroom __in the dormitory.
| A．neither; nor | B．neither; or | C．either; nor | D．either; or |
The river is said __________ in a fire during the past 10 years.
| A．to have polluted | B．it has been polluted |
| C．to pollute | D．to have been polluted |