We can savenature resourcesby usingsolar energy.
A B C D
22. The teacher ordered us not open our books until we were toldto do so.
A B C D
23. Mary was upset last night because she had to do too many homeworks.
A B C D
24. Last Tuesday Miss Nhungdidn't go to work because her illness.
A B C D
25Collectingcoins and stamps were my father’s hobby when he retired.
A B C D
1 nature => natural
2 open => to open
3 many homeworks => much homework
4 because => because of
5 were=> was
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