The government has taken some measures to solve the shortage of water, but it may be some time __ the situation improves.
| A．since | B．when. | C．unless. | D．before. |
If you are traveling ________ the customs are really foreign to your own，please do as the Romans do.
| A．in which | B．what |
| C．when | D．where |
Find ways to praise your children often，________ you’ll find they will open their hearts to you.
| A．till | B．or | C．and | D．but |
Don’t be afraid of asking your teachers for help ________it is needed.
| A．as | B．since |
| C．unless | D．when |
The engineers are so busy that they have no time for outdoor sports activities，________ they have the interest.
| A．wherever | B．whenever |
| C．even if | D．as if |
In some places women are expected to earn money ________ men work at home and raise their children.
| A．but | B．while |
| C．because | D．though |