He was told that it would be at least three more months _____ he could recover and return to work.

It's quite a time _____ Liu Xiang was injured in the foot, but we're sure it won't be long _____ he returns to
the track.

A computer is so useful a machine___ we can use everywhere.

John thinks it won't be long _____ he is ready for his new job.

— Tom is a sunny man.
— Yeah. ______ he is poor, he looks happy.

There is a widespread belief among the science world ____ we keep on _____  the earth as we are doing today,
the exist ence of us humans on this planet will be out of the question in some years yet to come.

It is partly ______ the summer day is longer that everything has a larger time to warm up.

_____ you drive carefully, you will be very safe.

_____we are not attacked by nuclear weapons, we promise that under no circumstances _____ use the
bomb first but we reserve the right to use it for counter-attack when necessary.

You may use room as you like ____ you clean it up afterwards.