Most air pollution is caused by the burning of ____ like coal, gas and oil.
.-----__Would you do me a favour and give me a ride?----- ______.
.Americans eat______ vegetables per person today as they did in 1990.
Anyone who always______ a difficult situation can’t become a successful man.
Low-carbon lifestyle is of great benefit to improve the world environment.________can be enjoyed from it until you have a deep understanding of it,however.
The scientist was rewarded by the government for________such a great,contribution to the country.