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Exercise 3. Choose the correct option A, B, C, or D to complete the sentences.
1. If they start saving money from now, they ________ afford to go to Ha Long Bay on holiday.
A. should B. need C. can D. must
2. If I get the job offer today, I ________ accept it and start working on Monday.
A. should B. might C. need D. must
3. If you want to enhance your well-being, you ________ stay up too late.
A. shouldn't B. may not C. might not D. needn't
4. If you don't charge the battery, your device ________ function properly.
A. mustn't B. can't C. shouldn't D. needn't
5. If you want to travel to Australia, you ________ have a valid passport.
A. should B. may C. can D. must
6. If it snows tomorrow, we ________ have to cancel our outdoor event.
A. can B. may C. must D. should
7. If you enroll in our intensive Spanish class, you ________ speak this language fluently after two months.
A. can B. should C. must D. need
8. If you want to pass the driving test, you ________ study harder and practice more regularly.
A. must B. will C. may D. might
9. If it's a private event, you ________ attend without an invitation.
A. shouldn't B. mustn't C. may not D. needn't
10. If you want to sleep well at night, you ________ drink too much caffeine after 3 p.m.
A. shouldn't B. may not C. can't D. won't