80.we should keep the environment clean.the environment_______________
81.Did they return those books to the library?were______________
82.i haven't seen hẻ sinve she left for hanoi.i last saw___________
83.How long have you learned english?How long ago______________
84.we spend an hour painting the school gate.it look____________
85.i go to phu bai airport about two hours by bus.it took__________
86.they did their homework from 2pmto 4pm.it___________________
87.what did she drink at the party last night?what was_________________
88.there is a river and a big lake in my village. my village_______________
89.learning english is not easy.it___________
(Làm phiền các bạn nghi hộ cấu trúc từng câu cho mình nữa nha .(nếu có thể)