27. catch up with sb / keep up with sb / put up with sb 赶上某人/ 跟上某人/ 容忍某人 28. change sth into sth / exchange sth for sth 把……变成/ 交换 eg. Can you change this note into coins? / 你能把这张纸币换成硬币吗? eg. May I exchange this book f...
4、So many directors ___ , the board meeting had to be put off. A. were absent B. been absent C. had been absent D. being absent 5、___ the temperature falling so rapidly , we couldn’t go on with the experiment. A. Since B. For C. As D .With 6、Al...
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