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~ -<br />

5. Jack is twenty-four, but he still lives with his parents. That saves him a lot of money.<br />

For example, he<br />

pay rent or buy his own food.<br />

I, ir8 A. must not B. don't have to C. doesn't have to<br />

l i<br />

6. The water in that river is badly polluted. You drink it.<br />

A. must not B. don't have to C. doesn't have to -<br />

7. If you have a credit card, you pay for a purchase in cash. You can charge it.<br />

' ,G Y .F* A. must not B. don't have to C. doesn't have to<br />

8. When an airplane is taking off, you have to be in your seat with your seat belt on.<br />

You<br />

stand up and walk around when an airplane is taking off.<br />

A. must not B. don't have to C. doesn't have to<br />

10-5 MODAL AUXILIARIES<br />

.2?!:<br />

(a) Anita<br />

. ...'

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