giúp mình với ạ 

phân tử hợp chất B gồm 2 nguyên tử X liên kết 3 nguyên tử O,nặng bằng 5 lần phân tử oxi.Tính phân tử khối của chất B và tìm tên nguyên tố x và viết CTHH chất B

cho tam giác MNP,D nằm giữa N và P.Qua D kẻ các đường thẳng song song với các cạnh MN và MP,chúng cắt các cạnh MP và MN theo thứ tự ở E và F.a)Chứng Minh tứ giác MEDF là hình bình hành. b)Gọi O là giao điểm của MD và EF,biết MD=8cm.Tính OD?

IV. Rewrite the sentences using the phrasal verbs given in the box. Make any changes if necessary.find out/ get on with/ look through/ come back/ look forward to/ face up to/ turn down/ bring out/ run out of/ face up to/ set up/ set up1.Mr. Smith started his first lacquer workshop three years ago.→...........................................................................................................................................................................................2.We have had no more milk in the fridge.→...........................................................................................................................................................................................3.He doesn’t have a really good relationship with his elder brother.→...........................................................................................................................................................................................4.I am feeling excited about my coming trip.→...........................................................................................................................................................................................5.How did you get information about this weekend’s exhibition?→...........................................................................................................................................................................................6.I always read the index first to know what a book includes.→...........................................................................................................................................................................................7.You have to accept the fact that you are the only student who failed the exam.→...........................................................................................................................................................................................8.Why did Daisy refuse your invitation?→...........................................................................................................................................................................................9.My favourite writer has just published her latest novel→...........................................................................................................................................................................................

II. Make a complex sentence from each pair of sentences using the subordinator provided in brackets. Make any changes if necessary.1.Michael put his watercolour landscape in a silver frame. Then he hung it on the wall (before)→...........................................................................................................................................................................................2.Olivia was late for school this morning. She missed the bus. (because)→...........................................................................................................................................................................................3.Rosie istrying her best to study well. Her parents will give her a trip to New York. (so that)→...........................................................................................................................................................................................4.It rained heavily. We had to postpone our camping trip (since)→...........................................................................................................................................................................................5.The teacher arrived. All the students stood up. (as soon as)→...........................................................................................................................................................................................6.Make sure your hands are clean. Then you have your dinner.(before)→...........................................................................................................................................................................................7.I enjoy her new book. It’s not quite as good as the last one. (though)→...........................................................................................................................................................................................