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15 ......you arrive at the office earlier than I do, please turn on the air-conditional
16 ....... not been for his young death, he would be a famous musician by now
17 .....to take good care of the car, it wouldn't break down so often
18 .....you tell lies to your boss, you'll be fired at once
19 ........ he revised all his lessons, he wouldn't have failed the exam
20 ...... Rita had got some sleep last night, she wouldn't be exhausted today
1.You ..musn't.... pick up flowers or break tree branches
2. I can't go to the movie tonight because I ..must.... study for final exams
3. The soup is too hot. You ...mustn't... eat it yet. Wait for it to cool
4. To stay alive, people ...must... breathe oxygen
5. You ...must... start a fire when you go camping in the forest
6. You ......must..... put litter in a trash can
7. If you want to travel to certain countries, you ....must.... get a visa
8. You ......musn't. swim under the waterfall. It's dangerous
9. You .must..... follow your tour guide to be safe
10. When the phone rings, you ...must.... answer it It's an important call
11. If you have an aquarium, you ...mustn't... give your tropical fish too much food or they'II die
12. To be a successful climber, you ..must.... have a great deal of stamina
13. You ....mustn't..... play loud music late at night. The neighbours will call the police
14. When you first meet at night, you .....mustn't.. ask personal questions. For example, not polite to ask a person's age
15. Everyone here ...must..... leave immediately! The building is on fire
16D
17B
18A
19C
20C
21B
22A