giúp với please ! !!!!!!!!!!!!!!!!!!!!!!!!!!!!

Em ko hiểu lên anh chị giúp em với ạ

Her mother/ suggest/ Mary/ go/ see the dentist. A: Her mother suggests that Mary goes to see the dentist. B: Her mother suggested that Mary went to see the dentist. C: Her mother suggested Mary going to see the dentist. D: Her mother suggested that Mary should go to see the dentist.

dien tich trung quoc bang bao nhieu

1.Người ta dùng một đòn bẩy có dạng như hình vẽ bên dưới để bẩy ống bê tông .Hỏi ống bê tông phải được buộc vào đầu nào ? Lực tác dụng vào đầu nào để được lợi về lực ? Giúp với 2.Khi kéo một vật có khối lượng 40kg bằng một ròng rọc cố định thì ta cần phải tác dụng một lực ít nhất bằng bao nhiêu ? ( bỏ qua ma sát giữa sợi dây và ròng rọc )

EX3: Finish each of the following sentences so that its meaning stays the same 1. Phillip had gone out before they arrives After …………………………………………………………………………… 2. I had lunch then I watched an interesting film Before ……………………………………………………………………….. 3. There was a power cut before they got out of the room When …………………………………………………………………………. 4. After the manager had informed us clearly about the job, we started our work è By the time…………………………………………………………………. 5. My father had had dinner by the time I came home è Before …………………………………………………………………………. EX4: Use the given words in the box to complete the following sentences Collapsed Disasters Erupted Homeless Raged Scattered Shaking Trapped Victim Volcano 1. Many people were…………………………………..in the burning building 2. The volcano ………………………….violently last year 3. An active ……………………………….may erupt at any time 4. The roof ……………………….under the weight of snow 5. My body was…………………………………..from the cold 6. The local authority ruled that he had made himself intentionally …………………………….and was therefore not entitled to be rehoused 7. She was the innocent ……………………………………of an arson attack 8. They called for a full investigation to help prevent future………………………………. 9. At the first gunshot, the crowd…………………………………… 10. The riots…………………………..for five days EX5: Find the mistake and correct 1. I came back home after my sister had finish her dinner 2. Frank said that he has met Sir. Alex Ferguson before 3. Before Christine goes to bed, she had drunk a glass of wine 4. She told her husband she hadn’t wore such a kind of dress before When I arrived at the stadium, the football match had sta hepl my

Tìm ca dao về thuyền . tìm 2 3 vd nha

: Khử Fe3O4 bằng H2 a) Tính thể tích khí H2 cần dùng ở đktc nếu sau phản ứng thu được 16,8g Fe. b) Tính số gam Fe3O4 đã bị khử.

Giúp mình mấy câu trắc nghiệm này nha

tính khoảng cách từ M (4;-3) để d: 2x-y-6=0