Fill in each blank with 'must' or 'mustn't'

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Date:
Class:
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EXERCISE 1
Fill in each blank with 'must' or 'mustn't'.
use the overhead bridge
1 You
to cross the road.
wear
2 It is raining heavily. You
your raincoat.
3 Water is precious. We
use it wisely.
on
Stience
for
4 We
talk loudly in the library.
5 Peter's hands are dirty. He
them before taking his lunch.
wash