Water is the most widely used resource in ______ industry, and plays ______ major role in energy production.
| A．不填; a | B．the; a | C．an; 不填 | D．an; the |
I’m sorry you’ve been waiting so long, but it’ll still be some time _________ Brian gets.back.
| A．before | B．since |
| C．till | D．after |
.—Did you return Fred’s call?
—I didn’t need to _________ I’ll see him tomorrow.
| A．though | B．unless |
| C．when | D．because |
.—Do you have a minute? I’ve got something to tell you.
—Ok, _________ you make it short.
| A．now that | B．if only |
| C．so long as | D．every time |
. My parents live in a small village. They always keep candles in the house __________ there is a power cut.
| A．if | B．unless |
| C．in case | D．so that |
.Many of them turned a deaf ear to his advice, __________ they knew it to be valuable.
| A．as if | B．now that |
| C．even though | D．so that |