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mustn’t needn’t can’t won’t
of no value very important so expensive that people don't know how much it is valueless"
needn’t can’t may not mustn’t
Yes，the message is important T.hat’s very nice Thanks for telling me I’ll be g1ad to
Remember Be sure Don't forget Make sure
Remember Don’t forget Be sure Make sure
is; is are; are are; is is; are
to tell people that trees are very useful to man to warn people not to cut down trees any more to warn that man mustn't destroy forests any more to explain how trees help to prevent drought and floods
can't may so soon might as well won't soon
is it are they isn’t it aren’t they
isn’t doesn’t wasn’t hasn’t
give it up; I will give it up; I won’t give up it; I will give up it; I won’t
People spend more time at shopping centers that have trees In hot countries，urban forests are cool places for walking and other healthy exercises But you are not in rural area Trees take pollution out of the air In 2033，it will have 5 million trees It has many kinds of birds in the country
study to study studying studies
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