Chọn A,B,C,D 1. The room smells bad. Somebody...................in here. A.has smoked. B.smoke. C.is smoke. D.is smoking. 2. These people live in the mountains ,.......................they have a lot of fresh air. A.so B.because C.but D.or 3. Is there ..............orange juice in the fridge? A.an B.a C.any D.or 4. She loves.................... flowers and putting them into different vases. A.buy B.buing C.to buy D.bought