Don’t forget to turn on your radio at 7 p.m. this evening. We’ll be back _______ then.
| A．in the air | B．by air | C．on the air | D．off the air |
_____ we got to the station, the train had left already.
| A．If | B．Unless | C．Since | D．When |
_____ the rain stops, we' 11 set off for the station.
| A．Before | B．Unless | C．As soon as | D．Though |
She was _____ tired _____ she could not move an inch.
| A．so, that | B．such, that | C．very, that | D．so, as |
We didn’t go home _____ we finished the work.
| A．since | B．until | C．because | D．though |
I'll stay here _____ everyone else comes back.
| A．even if | B．as though | C．because | D．until |