Scientists say it will be five or six years _____ it is possible to test this medicine on human patients.

You have to have a good preparation for the exam__________ you can do well in it.

There is no possibility ______ all the students can pass the college entrance examination.

While watching television, ________.    

However much ___________, it will be worth it.

It’s not necessary to explain the truth _____ there is spring wind, there is green grass．

Stronger and more lasting memories are likely to be formed ________a person is relaxed．

Please leave your phone number ______ we can get in touch with you in case of emergency.

       is expected, according to the online survey, is that housing prices can’t go up any more.

Some researchers believe that there is no doubt ____ a cure for AIDS will be found.