_ _ busyschoolwork, the children also have to take arts, music and sports classes intheir free time.

Are you willing to live on Mars one day –_____ It sounds exciting， but it still worries me.

When you boil the milk you must _______ it carefully.

How do you communicate_______ l your friends-I like to chat with them_______ l the Internet.

Don’t worry, Jim. I can lend you the money.—Thank you very much, Bob. You are always so __________.