LÀM GIÚP EM NHA .CẢM ƠN RẤT NHIỀU.

21 Nam...a letter from his penpal (just / receive) 22 This is the most interesting film I... (see) 23 That boy...at the moment ( sleep) 24 Miss Hoa...to Phan Thiet two day's ago ( go) 25 We... our homework everyday (do) 26. They....their house before last Tet holiday (decorate) 27 We...each other since last year ( not see) 28 Mr Long... a house recently ( build) 29 It... now ( still/rain) 30 I... a doctor in the future (become) 31.They...soccer at this time ( play) 32 It is the first time I... a motorbike (ride) 33.He...Enghish every day ( study) 34 They...their grandparents last Sunday ( visit) 35 I... to Hanoi next week (go) 36 This boy...his teeth three times a day ( brush) 37 she often...the clothes in the morning ( wash) 38 we...music at that time (practise) 39 the children...soccer at this time (play) 40 Lan always...up early and goes to school on time (get) 41 Mr Long...back from his farm (just / come) 42 Pham Duy....over one thousand songs up to now (compose) 43 They... their house beautify before last Christmas ( decorate) Giúp mình với

2. Một vật sáng AB đặt trước gương phẳng như hình vẽ : a. Vẽ và nêu cách vẽ ảnh A/B / của vật AB qua gương b. Nhận xét các tính chất ảnh A/ B / của vật AB c. Dùng vòng cung đánh dấu vùng không gian trước gương đặt mắt quan sát được ảnh A/ của điểm

viết một đoạn văn bằng tiếng anh ít nhất 6 câu có câu có cấu trúc: + sth can/can't +be+ v-ed/p2 +sth should/shouldn't +be+ v-ed/p2 +sth must/mustn't +be+ v-ed/p2 +they/it +say/think/believe/...+that s+v+o

bài 6 4. Choose the correct answer. 1. Was Tom there when you arrived?” - “Yes, but he home soon afterwards.” A. goes B. went C. had gone D. were going 2. Before Jennifer won the lottery, she any kind of contest. A. hasn’t entered B. doesn’t entered C. wasn’t entering D. hadn’t entered 3. “Who was the woman in red dress? Did you know?” - “No, I who she was. I her before.” A. didn’t know - hadn’t seen B. didn’t know - hasn’t seen C. hadn’t known - hadn’t seen D. don’t know - hasn’t seen 4. It’s two years Joe. A. that I don’t see B. that I haven’t seen C. since I didn’t see D. since I saw 5. The man sitting next to me on the plane was nervous because he before. A. hasn’t flown B. didn’t fly C. hadn’t flown D. wasn’t flying 6. They in Scotland for ten years. Now they live in London. A. lived B. have lived C. has been living D. had lived 7. As soon as Laura the house, it started to rain. A. has left B. was leaving C. had left D. had been leaving 8. Sorry we’re late, we the wrong turning. A. had taken B. were talking C. took D. are talking 9. We in New York for ten years and then we here in 1987 A. have lived - moved B. lived - moved C. lived - had moved D. had lived – moved 10. When Martin the car, he took it out for a drive. A. had repaired B. has repaired C. repaired D. was repairing 11. We them before the reception yesterday. A. haven’t met B. hadn’t met C. didn’t meet D. wouldn’t meet 12. Karen didn’t want to come to the cinema with us because she the film. A. has already seen B already had seen C. had already seen D. saw 13. The man looked familiar. I him somewhere before. A. saw B. have seen C. had seen D. see 14. Last night a tornado swept through Rockville. It everything in its path. A. destroyed B. was destroyed C. had destroyed D. has destroyed 15. When we the bill, we left the restaurant A. had paid B. were paying C. paid D. had been paid

Cho hình vuông ABCD cạnh bằng a, I là trung điểm của cạnh AB. Trên tia đối của tia CD, CB, DC, AD lần lượt lấy các điểm M, N, P, Q sao cho CM=a, CN=2a, DP=2a, AQ=3a a) CMR tam giác IAD, MCN và DPQ là các tam giác đồng dạng b) Tam giác MNQ là tam giác gì? Tứ giác MNPQ là hình gì? c) CMR các đường thẳng ID đi qua trung điểm E và F của NP và MQ d) CM I là trung điểm của NQ e) Gọi S là giao điểm của QM và PN, R là trung điểm của PQ. C/m SR, QN và CD đồng quy

căn bậc hai(x^2 + 5*x -6) = 2*x+3

- Cách c/m: Để c/m dd là đường trung trực của đoạn thẳng AB, ta c/m dd chứa hai điểm cách đều A và B hoặc dùng định nghĩa đường trung trực. dd nghĩa là méo gì

Cho tam giác ABC vuông cân tại A, đường trung tuyến AM(M thuộc BC). Lấy điểm P trên cạnh AB sao cho P khác A và B, vẽ đường thẳng song song với BC và AM, hai đường thẳng này cắt AM và BC lần lượt ở N và K. a) Chứng minh PNMK là hình bình hành b) Trên tia đối của tia MA lấy điểm D sao cho MD=MA. Chứng minh ABDC là hình chữ nhật c) Chứng minh PK+PN=AD/2

bài 6 TA , giúppp VI. Complete the sentence with the past simple or past perfect form of the verb in brackets. 1. They (live) in Paris for 10 years before they (move) home. 2. As soon as I (download) the document, I knew I (make)a mistake. 3. Mary (ring) John’s doorbell at 8:15 yesterday but John (already/ leave) the house. 4. By the time the firemen (arrive), the fire (destroy)three houses. 5. Our economy (not stand) a chance of developing before thegovernment (adopt) the open-door policy. 6. When I last (speak) to her, she still (not finish)her assignment. 7. Nobody (come) to the meeting because Angela (forget)to tell them about it. 8. She (go) to Disneyland three times when she (be) a little girl. 9. After I (complete) the form, I (give) it to the secretary. 10. Sarah (drive) three hundred miles by the time she (arrive)in Tacoma.