Who’s singing in the bathroom— It ________ be Mr. Brown. Nobody sings like that except him.

What will the weather be like tomorrow — It might be ___ _ .

He may win the first prize in the national competition, _______ he is likely to be admitted to Peking University.

How long are you staying–I don’t know. _____

He finally won the general election because many of his promises were quite popular ________ the voters.[ ]