23. By the time he ……………., he had driven six hundreds miles. A. stops B. had stopped C. stopped D. has stopped
24. A new bridge …………….. over this river for a week . A. has built B. will build C. has been built D. build
25. We're reading a ……………. book this week. A. differ B. difference C. different D. differently
26. She gave him a ……… look. “Are you really sure?” she demanded. A. challenge B. challenger C. challenged D. challenging
27. At the moment, the baby whale ……..about 900 kilos and is enjoying his new home. A. as weighing B. can weigh C, weigh D. weighs
28. You've got to try to keep ………. as you grow older. A. act B. active C. action D. actor