In recent years, the problem of environmental pollution has (17)__________ a serious situation in big cities of our country. Why? - Nowadays, we are living in a city with an increase in population, so domestic waste is the first reason. Then many people’s social (18)__________ is not high. In several areas, they throw trash on the street or onto the rivers. It is easy for us to see rubbish of all kinds (19)__________ on the water. Moreover, many uncultured people even “make water” in the public place. Secondly, our city is overloaded with vehicles that expel all (20)__________ and dust from them. This contributes to the heat of the air, and causes pollution. Thirdly, in several places, trees (21)__________ cut down to have room for buildings, hotels, or supermarkets. This makes the atmosphere in our city muggy and stuffy as well. Also, many factories send out waste into the rivers or poisonous gas into the air. Finally, the drainage system in our city is very old and downgrade, so it’s always flooded whenever it rains. In conclusion, air (22)__________ in the cities are really alarming problem now! What do you think about this?
- A. became B. become C. to become D. becoming
- A. compliment B. announcement C. authority D. consciousness
- A. disappointing B. saving C. floating D. consuming
- A. smoke B. doll C. dormitory D. existence
- A. to be B. have been C. having been D. to have been
- A. pollutants B. polluting C. polluted D. pollution
