______ we have enough evidence (证据), we can't win the case.

She had to drop out of school _____ her family couldn’t afford the cost of her education.

Scientists say it will be five or six years __________ it is possible to test this medicine on humans.

How can you expect to learn anything ______ you spend all your time playing computer games?

You are well prepared for the job interview, ______ there’s no need for you to get so nervous.

I was walking along the road _____ someone patted me on the shoulder from behind.

_____ you have the chance to study, you’d better make full use of your time.

______ you are a college student，you should learn to be independent of your parents’ help.

How can they expect to learn anything ________they never listen?

The so-called Asia—Pacific century will make no sense_____ China develops．