we will suffer / clean, / Unless we keep / from pollution / our environment/.we will suffer / clean, / Unless we keep / from pollution / our environment/.
Giải thích
Đáp án đúng: Unless we keep our environment clean, we will suffer from pollution.
Dịch nghĩa: Trừ khi chúng ta giữ môi trường sạch sẽ, chúng ta sẽ bị ô nhiễm.