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26 tháng 3 2017

Underline the model verbs you choose:

Life started in the ocean, but humans aren't natural swimmers. We (1. can - can't - must) swim as babies, but we forget and then we (2. musn't - should - must) learn to swim again.

We (3. should - can - musn't) foget that our world is mainly water. So we (4. ought to - must - should) all learn to swim. We (5. can - must - musn't) try to stay away from water, but it is very difficult. The time always comes when we (6. should - must - can) cross water.

We (7. should - must - can) learn to swim when we are young. It is easier to learn then. Our parents (8. can - must - musn't) help. They (9. shouldn't - ought not to - should) give us the opportunity to learn to swim.