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i. choose the correct answer.
1. you never do that again!
a. need b. must c. should
2. they can go home, they stay any longer.
a. needn't b. mustn't c. shouldn't
3. children know the traffic rules.
a. should b. must c. need
4. you are in a hospital. you be quiet.
a. must b. need c. should
5. our teacher says that we do any homework today.
a. mustn't b. should c. needn't
6. if you have problems with your health, you eat a diet.
a. must b. need c. should
7. you say any more. i agree.
a. mustn't b. shouldn't c. needn't
8. they worry. she can do everything herself.
a. needn't b. mustn't c. shouldn't
9. do you hear the command? you be quiet!
a. must b. need c. should
10. the pie is very tasty. we try a piece.
a. need b. must c. should
1c 2a3d4a5c6c7c8a9a10c
если в предложении дают рекомендации то будет should . Если в предложении использовался can то означает необходимость need. Если это правила этикета или закон то будет must.