Cách làm cho bạn:
1. My brother said he was doing research on sustainable tourism.
2. Minh asked Nam if / whether he liked watching programmes about wildlife and nature.
3. Hoa asked Mr Smith what they could / can do to reduce the impact of global warming on the environment.
4. The club's secretary said they were going to organise a lot of activities during Earth Hour that year.
5. The teacher explained that the animals would /will not survive extreme cold weather in the North.
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