What do you know about Darwin after he returned from the trip by sea?— Well, he got married and ________ down to live in London. [ ]

You must have waited here for a long time,__________

Is Jack on duty today—It ________ be him. It’s his turntomorrow.

Why are you so anxious? It isn’t your problem _____.[ ]

The student all the teachers were proud was accepted by Beijing University last year