The train leaves at 6:00 p.m. So I have to be at the station _______5:40 p.m. at the latest.
| A．until | B．after |
| C．around | D．by |
The roof began to fall ______ she had time to dash into the room to save her baby.
| A．after | B．as | C．before | D．until |
Don’t be so discouraged. If you ______ such feelings, you will do better next time.
| A．carry on | B．get back | C．break down | D．put away |
No such authorization ______ be given without the president’s written permission.
| A．should | B．shall | C．would | D．may |
eBay sells connections，not goods，______ buyer and seller into contact with each other.
| A．being put | B．putting | C．has put | D．puts |
With more forests being destroyed，huge quantities of good earth ______ each year.
| A．is washing away | B．is being washed away |
| C．are washing away | D．are being washed away |