Don’t look down upon Bob. He has his own advantages. —-Oh, yes. ______ others are weak, he is strong.

You’d better not _______ these two sentences, otherwise thereaders cannot fully understand you.

I think she is ________at dancing thansinging.

Lucy does better in drawing than hertwin sister.

There’s ______ ball on the ground.Would you please pass ______ ball to me—With pleasure.