I think _______ is meaningful to help other people.

______ unless I call you.

Hello, this is Jack. May I speak to Tom?– Sorry, he isn’t in at the moment. If he _______ back, I’ll ask him to call you back.

Tom likes doing things with his family. He’s learned much from ___ His family help him a lot.

Would you mind if I turned down the tape recorder a little?—______.