As I looked at the memorial, I thought about ____ terrible disaster it was for the people in Nanjing then and ____ they were to fight the Japanese invaders.
Half the world's population __________ water shortages within 15 years according to the World Bank, just one of many recent alarming reports on the world's fresh water supply.
It is reported that in our country cities __________ heavy air pollution that is 30 percent above the national standard or higher should try to meet standards by 2030.