51 be made of 由……制成（制成以后还看得见原材料）
52 be not sure 表不确定
53 be on a visit to 参观
54 be popular with sb 受某人欢迎
55 be quiet 安静
56 be short for 表**的缩写 eg： 陶 is short for 陶俊杰
57 be sick in bed 生病在床
58 be sorry to do sth be sorry for sb eg ： I am sorry for you
59 be sorry to hear that
60 be sorry to trouble sb eg ： I am sorry to trouble you