A medical team was sent to Japan by air five hours ago.—So they ______________ have arrived by now. The flight usually takes four hours or so.

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

You’d better not leave the medicine itis within kids’ reach

How much shall I pay for the phone cell? — You _______. It’s free of charge.

ew difficulties ________in yourwork, it’s always important to use your brains