She used to _____ few friends, but now she has many friends.

I’m sorry to keep you waiting.— It doesn’t matter. I ____ here for only a few minutes.

The teacher stressed again that the students should not ______ any important details while retelling the story.

isn’t him, who________ it be

was the training that he had as a child________made him such agood pianist, received by teenagers as well as adults．