Beijing's first unmanned subway trains, which can run ______ without the control of any drivers, are expected to be put into operation next year.
| A．regularly | B．deliberately |
| C．automatically | D．desperately |
----Smoking is bad for your health.
---- Yes, I know. But I simply can’t ______.
| A．give it up | B．give it in | C．give it out | D．give it away |
.I don’t think that the sentence need ______again.
| A．explaining | B．be explained | C．to be explained | D．explaination |
Five athletes competed_____ the gold medal _____ each other _____ the 100-meter dash.
| A．to , with, in | B．at ,against, by | C．of, at, because | D．for, with, in |
Look at the timetable. Hurry up! Flight 4026 ______ off at 18:20.
| A．takes | B．took | C．will be take | D．has taken |
The Dragon Boat Festival _____ the beginning of the hottest season of the year.
| A．marks | B．makes | C．falls | D．comes |