Mary must keep her mind on her medical studies now, so it would be years ______ she could think about marriage.
It is a pity that none of the ______ stopped ______ the poor man lying there, begging.
I went to the newly-built super-market and found there was nothing worth_____.
Don’t come in unless ________.
Many difficulties have ______ as a result of the overuse of coal
There is no doubt _____ she will be able to repay the money on time.