No student ______ go out of school for snacks during the break without the teacher’s permission.
—Will you join us in the party this Saturday evening?—If I ____ ,I would ;but I will have left for Japan on business by then.
He didn’t put the things ______ they belonged, for ______ reason he got his punishment.
How can you expect him to make any progress _____ you never give him a chance to have a try?
It is amazing that the little boy can swim ________the river ________100 meters in width.
We used to work in the same office and we____ often have coffee together, which I missedso much years later.