a 2. X had
better not 3. √ 4. X mustn't download 5. √ 6. X ought to 7. √ 8. √ 9. X ought
to have thought of.
b 2.√ 3. √
4. had better 5. should 6. can't 7.√ 8. √.
c 2. no
difference 3. no difference 7. must
is stronger 8. had better is more
urgent.
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