用must, mustn't, can, can't填空。 |
1. Don't open your present now! In China you _____ wait and open it later. 2. —Can I do cleaning at Spring Festival? —No, you_____ . —It's bad luck. 3. In America you _____ open your present immediately. You don't have to wait! 4. In Britain you _____ ride your bicycle on the pavement _____. It's too dangerous. 5. In Britain, you _____ be 18 if you want to drive a car. |