49. get back 回来，取回

48. no longer/more=not…any longer/more 不再

47. lots of=a lot of 许多

46. all by oneself 独立，单独

45. out of从……向外

44. on time 按时

43. at the weekend 在周末

42. had better(not) do sth. 　 最好(不要)干某事

41. take exercise运动

40. look over 检查