The field research will take Joan and Paul about five months;it will be a long time_____we meet them again.
| A．after | B．before |
| C．since | D．when |
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 |
____ the police know the killer's identity, they are getting close to catching him.
| A．Even if | B．Although | C．Now that | D．As long as |
You have to get rid of smoking, ____ you may die of lung cancer.
| A．and | B．but | C．so | D．otherwise |
We had to wait half an hour _______ we had already booked a table.
| A．since | B．although | C．until | D．before |
Help others whenever you can _______ you will make the world a nicer place to live in.
| A．and | B．or | C．unless | D．but |
The medicine works more effectively ______ you drink some hot water after taking it.
| A．as | B．until | C．although | D．if |
______well prepared you are, you still need a lot of luck in mountain climbing.
| A．However | B．Whatever | C．No matter | D．Although |
It has been proved______eating vegetables in childhood helps to protect you against serious illnesses in later life.
| A．if | B．because | C．when | D．that |
— Are you ready for Spain?
— Yes. 1 want the girls to experience that______they are young.
| A．while | B．until | C．if | D．before |