air becomes ____and ____(越来越薄)as the plane ____(climb)in the

air becomes ____and ____(越来越薄)as the plane ____(climb)in the We ____ in oxygen in the air o ____ out,in the open air ____ ____ ____ stay in the room with the air-condiioner in s The plane will ____ in half an hour. 爬山是climb ____ the mountain china becomes the new station in human's relay of 3 ____ ide 英语翻译The boys are ____and ___ ____ ____ afraid of snakes. 4.Has the plane safely ____ yet? The plane ____ to Guangzhou every day. They ____ ____ ____ in the afternoon Spring is coming the weather becomes _______and ____ 填空