She couldn' t find her son_ she had dropped him off．
| A．when | B．until |
| C．although | D．where |
He says difficulty you meet with in your work, you can turn to him for help
| A．how | B．however | C．what | D．whatever |
The new policy allows a couple to have a second birth____either is an only child.
| A．if only | B．on condition that |
| C．unless | D．until |
Allow children the space to voice their opinions, _____they are different from your own.
| A．as if | B．even if |
| C．in order to | D．so that |
---The mountain village is so beautiful.
---Yes. Moreover, ______the villagers live, there is fresh air.
| A．that | B．when | C．where | D．whether |
Many young people in the West are expected to leave __ could be life’s most important decision—marriage—almost entirely up to luck.
| A．as | B．that |
| C．which | D．what |
Stand _____ you are, and I will come and help you.
| A．while | B．where |
| C．which | D．what |
It’s much easier to make friends ____ you have similar interests.
| A．unless | B．when |
| C．even though | D．so that |
We are going to the theater tomorrow ______ all the tickets are sold out.
| A．when | B．unless |
| C．whether | D．because |
____ regular exercise is very important, it’s never a good idea to exercise too close to bedtime.
| A．It | B．As | C．Although | D．Unless |
______ she has earned her PhD, she wants to find a job with higher pay.
| A．As if | B．Now that |
| C．Even though | D．In case |
______ environmental damage is done，it takes many years for the ecosystem to recover．
| A．Even if | B．If only |
| C．As if | D．Once |
Stand _____ you are, and I will come and help you.
| A．while | B．where |
| C．which | D．what |
______ more than half of us were against the new plan, he still decided to carry it out.
| A．As | B．Since | C．Unless | D．While |
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