Task 3. Choose the correct modal verb. All passengers ... (should/must) wear seat-belts.
My tooth hurts. I think I ... ishouldn't/mustn't) see a dentist
(shouldn't mustn't) walk on the grass.
You ... (mustn'u shouldn't) be kind and polite.
He ... (mustn't shouldn't) whistle inside a house.
Your brother ... (should must) cat healthy food.
You ... (should/must) read this book. It's really nice.
Greg ... (must'should) spend more time on English grammar.​

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