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6. John can't come because he
b.can
a. should
7. I know they enjoy their work, but they
a. shouldn't
b.don't have to
8. Elderly people
a. shouldn't
9. He
a. must
10. Everyone
traffic law.
a.isn't allowed to
b. should
work tomorrow.
c. mustn't
be treated with great respect
c.must
d. has to
work at the weekends. It's not good for them.
d. have to
b. must
c.aren't obliged to
use chopsticks for spring roll. It is finger food.
b.has to
c.doesn't have to
d, should
wear a helmet when riding a motorbike. It's mandatory according to
d. mustn't
c. can
d. shouldn't