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Answer
Exercise 1
1. Double
2. Double
3. Modal like
4. Single
Exercise 2
1. We could swim in the swimming pool later.
2. She may be soaking wet when she arrive later.
3. He have to make sure he done his work or else he will be doomed tomorrow.
4. She must do all his work before having fun.
5. He must be still sleeping and snoozed his alarm.
6. She had better study or else will fail in the test.
7. You ought to buy now because it was so cheap.
8. She could play the piano before but now not anymore.
9. You must be very exhausted after your long trip.
Exercise 3
1. Should
2. May
3. To
4. Will
5. May
6. Should
7. To
8. To
9. To
Exercise 4
1. A
