30. A refused=rejected:tu choi><agreed:dong y

31. D you're welcome:khong co gi

32 A thank you: cam on

33 D children's education: giao duc tre em. (cau dau tien)

34 A.teachers they thay the cho teachers

35 C.help children .They say you can only help them learn

36 .D Children had to go on repeated things until they knew them by heart: tre em da phai lap lai nhieu lan lien tuc cho den khi ho da thuoc long

37. C. sit for hours.In the past, teachers make children sit still for hours

38 B.enjoy baking ADJ+V-ING

39.A hear of:nghe ve

40.A that,which thay the cho one special custom o day khong co which nen dung that

41.A wear in: mac vao

42.elder for elder people:danh cho nguoi gia

43.A was playing->were playing(children o dang so nhieu)

44.D with I-> with me (I phai chuyen thanh tan ngu me)

45,C have->had (cac su viec deu xay ra lien tiep trong qua khu nen have chuyen thanh had cho cung thi)

46.C some book were bought last week(bi dong thi qua khu don s+was/were +V3/ed)

47.A said co the chuyen thanh ask hoac told nhung said/ask phai them that + menh de S+V con told thi dung told sb to do sth

48.A dai tu lien he

49.C although+S+V

50B cau nay dung cau dk loai 2 (su viec khong xay ra o hien tai)nhung doesn't pass->passed ;is lazy->weren't lazy