Ex 2. Chia động từ ở câu điều kiện loại 1,2 1/ If the emission of CO2 (continue) at high rate, the climate (destroy)_ dirty, the breathing problems (reduce) 2. If the air (not be) 3/ We (save) the trees If we (save)_ 4/ If schools (teach)_ paper. about environmental problems. All students (know) how to protect the environment. 5. What (do) you if you (be) President. 6. If I(own) a lonely island, I (build) a huge house by the beach.