What’s this in English?— _______ a quilt.

Listen! Is Mary singing in the next room?—No. It _______ be Mary．She has gone to Shanghai for an important meeting.

How time flies ! Several years _____ since we last met at Jack’s Party.

There____________ many trees in front of my house now.

I don’t know the man came to our party last night. Can you tell me he is? [ ]