—Mom, when can I go out to play football?
—Finish your homework first, or I ________let you go out.
| A．don't | B．didn't | C．won't | D．haven't |
He suddenly return ___ a stormy night.
| A．in | B．during | C．at | D．on |
__________! There comes a train!
| A．Look out | B．Look around | C．Look forward | D．Look on |
The car runs ___ a very high speed and directly hits the tree beside the street.
| A．on | B．with | C．at | D．in |
The old man ___ a blue sweater is our new headmaster.
| A．with | B．in | C．on | D．into |
___ the beginning of the meeting, the president made a speech ___ how to reduce pollution.
| A．at; in | B．at; on | C．in; on | D．on; on |