Cách làm cho bạn:
1. Mrs Le explained that the burning of coal led / leads to air pollution.
2. Nam said he had to present his paper on endangered animals the following week.
3. Linda asked the speaker if / whether human activities had / have an impact on the environment.
4. Nam asked Mai what environmental projects her school was working on.
5. Tom said to / told Nam that he would read more articles before writing the essay.
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