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60.       (祝賀) you and your friends on your success in the activity.

59. I think the course is below your       (水平) .

58. We all hope to live in a        (充滿關(guān)愛的) environment.

57. Wherever you arc. you should have the courage to        (克服，戰(zhàn)勝) problems.

56. It will take        (兩倍的，加倍的) the time to walk to the village with heavy bags.

55. My sister has studied in Peking University for four years and got a d      in history last year 

54.What a hot day!After a long walk they were very t      and tired.

53. When you use this machine. you must follow these i       .

52.I always sat in the front r      when I was a primary school student because I used to be short.

51.S       I pick you up from the station at ten o'clock tomorrow morning?