You need to take your job________if you want to keep it.

You’d better book the tickets in advance; _______ we may miss the concert.

--- I __________ agree with what he said. Actually I feel what he said is much to the point and makes good sense. --- Yes, I think so.

–This summer is very hot. --Yes, but it’s not __________ as hot as last summer.

Mr.Brown ___ goes to bed before midnight.