1. Coal is more expensive and more polluting than natural gas (câu so sánh)
2. We are looking for cheap and clean and effective sources of energy. (biến đổi câu)
3. Will fossil fuels be replaced by solar and wind within 20 years? (câu bị động)
4. You should switch off electrical appliances when they aren’t in use. (biến đổi câu)
5. People will use biogas for fuel in homes and for transport (câu chủ động)
6. His car is red (biến đổi câu)
#Chúc bạn học tốt
