Câu hỏi: Choose the letter A, B, C or D the word that has the underlined part different from others.

Good morning, I’m Alex. And today I will talk about recycling. Recycling has a lot of advantages. Firstly, it saves the environment. Instead of cutting more trees to produce paper, we can use recycled papers. Secondly, recycling also saves energy. Thirdly, recycling helps reducing global warming and reduce pollution. Finally, recycling helps saving money. Recycled articles cost less than new ones. In conclusion, using recycled product is environmentally-friendly and money-saving. Therefore, we should put plastic bottles in recycling bins and buy recycled products.

The first reason is recycling preserves the environment.

Air pollution is one of _________ (6) problems of the current time all over the world. There ___________ (7) a lot of reasons for this pollution. First of all, the release of air pollutants such as smog and solid materials cause air pollution and health issues ___________ (8) human. ___________ (9) dirty wastes in big cities are polluting the whole atmospheric air. Thirdly, motor vehicles are releasing polluted gases contributing to the air pollution. Finally, some natural ________ (10) like dust, soil particles, and natural gases are also the source of air pollution.

Question 9

They are using leaves __________ food.

No/ house/ street/ older/ this one.