WE WENT TO STAN’S HOLIDAY PARTY LAST YEAR, ______ WE

35.We went to Stan’s holiday party last year, ______ we ?A. did B. didn’t C. do D. hadn’tV. Đọc kĩ đoạn văn sau, chọn phương án thích hợp nhất trong số A, B, C, hoặc D để điền vàomỗi khoảng trống.CLEAN AIR AND DIRTY AIRClean air is the air which has no harmful levels of pollutants (dirt and chemicals) in it. Clean air isgood for people to breathe. When too much dirt and chemicals get into the air, the air is dirty or polluted.Dirty air is not good for people to breathe.Air pollution is a big environmental health problem, which affects both developing and developedcountries. Much of our air pollution comes from burning. For example, when we burn gasoline to operatemotor vehicles, carbon monoxide (CO), is released into the air. Carbon monoxide is an odorless andcolorless gas, but it can be very harmful to our health when there is enough of it in the air we breathe.