Learning to write is learning to think. You don’t know things clearly _________ you can writethem down.
—Hi, Tony. ____ is my friend, Jack. —Hello, Jack! Nice to meet you.
—____ are the pants?—They are 180 yuan.
—____ —Sorry. She isn’t at home now.
—What can I do for you? —I want two ____.
—Please ____ the tree. Can you ____ some apples on it? —Yes, I can.