21. This area couldn’t _______ the effects of the earthquake quickly without the help from other areas.
A. return form B. suffer from C. recover from D. learn from
22. The spokesman seated himself at the desk calmly since he _________ for any question from the reporters.
A. was preparing B. was prepared C. prepared D. has prepared
23. Upon _________at the office, the general manager required the chief engineer _________ testing the new model as soon as possible.
A .he arrived; start B. his arriving; started C. he arrived; starts D. his arriving; start
24. Jack Ma often insists that there _________ no excellent businessman if everything goes too smoothly and that clear mind _________ if one wants to be excellent.
A. be; be needed B. will be; be needed
C. would be; is needed D. be; is needed
