——It is a long time _____I saw you last. ——Yes.And it will be a long time _____ we see each other again.
Is this museum ______ the students visited last year?
They got to the railway station, _______ the train ________.
Lincoln had very little free time ______ he could spend studying then.
It is the place _____ I once visited when I was young.
Put the book ______ it should be when you’ve finished reading it.