Hai số có hiệu là 4275. Nếu thêm vào số bị trừ 1027 đơn vị và bớt ở số trừ 2148 đơn vị thì được hiệu mới bằng bao nhiêu ?

help!!!!!!!!!!

Cho những kết hợp sau:

Vui mừng, nụ hoa, đi đứng, cong queo, vui lòng, san sẻ, giúp việc, chợ búa, ồn ào, uống nước, xe đạp, thằn lằn, tia lửa, nước uống, học hành, ăn ở, tươi cười.

Hãy xếp các kết hợp trên vào từng nhóm: Từ ghép có nghĩa tổng hợp, từ ghép có nghĩa phân loại, từ láy, kết hợp 2 từ đơn.

Giúp mình với

Trạng ngữ là: Sau lần gặp ấy trở về

21. Almost everyone _______ for home by the time we arrived.

A. leave B. left C. leaves D. had left

22. By the age of 25, he ______ two famous novels.

A. wrote B. writes C. has written D. had written 23. When her husband was in the army, Mary ______ to him twice a week. A. was reading B. wrote C. was written D. had written

24. I couldn't cut the grass because the lawn mower ______ a few days previously.

A. broke down B. has been broken C. had broken down D. breaks down 25. I have never played badminton before. This is the first time I _____ to play.

A. try B. tried C. have tried D. am trying

26. Since _______, I have heard nothing from him.

A. he had left B. he left C. he has left D. he was left

27. After I _______ lunch, I looked for my bag.

A. had B. had had C. have has D. have had

28. By the end of next year, George _______ English for two years.

A. will have learned B. will learn C. has learned D. would learn

29. The man got out of the car, ________ round to the back and opened the book.

A. walking B. walked C. walks D. walk

30. Henry _______ into the restaurant when the writer was having dinner.

A. was going B. went C. has gone D. did go

31. He will take the dog out for a walk as soon as he ______ dinner.

A. finish B. finishes C. will finish D. finishing

32. I will be glad if he _______ with us.

A. had gone B. did go C. went D. goes

33. Ask her to come and see me when she _______ her work.

A. finish B. has finished C. finished D. finishing

34. Turn off the gas. Don't you see that the kettle ________?

A. boil B. boils C. is boiling D. boiled

35. Tom and Mary ______ for Vietnam tomorrow.

A. leave B. are leaving C. leaving D. are left

36. He always ________ for a walk in the evening.

A. go B. is going C. goes D. going 37. Her brother ______ in Canada at present.

A. working B. works C. is working D. work

38. I ______ to the same barber since last year.

A. am going B. have been going C. go D. had gone

39. Her father ______ when she was a small girl.

A. dies B. died C. has died D. had died