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19. We live day by day, but in the great things, the time of days and weeks ______ so small that a day is unimportant.
A. is B. are C. has been D. have been
分析：A。句子主語為the time，故用謂語要用單數; 再根據句子前后的時態live和is，可知此處宜用一般現在時，不用現在完成時，故選A。
20. — ______ you ______ him around the museum yet?
— Yes. We had a great time there.
A. Have; shown B. Do; show C. Had; shown D. Did; show
分析：A。根據問句中的yet可知，所談論的事情發生在最近的過去，且問話者很關心這個過去發生的事情對現在的影響和結果，所以用現在完成時。注意：不要受答語中過去式謂語had的影響而誤選C。
21. —I have got a headache.
—No wonder. You ______ in front of that computer too long.
A. work B. are working C. have been working D. worked
分析：C。由于在電腦前工作太久，所以導致了現在頭痛的結果，故空格處應填現在完成時或現在完成進行時，即答案選C。
22. Professor James will give us a lecture on the Western culture, but when and where ______ yet.
A. hasn’t been decided B. haven’t decided
C. isn’t being decided D. aren’t decided
分析：A。根據句意，此處應用被動語態，不用主動語態; 再根據句末的yet可知，最好用現在完成時。故選A最佳。
23. So far this year we ______ a fall in house prices by between 5 and 10 percent.
A. saw B. see C. had seen D. have seen
分析：D。短語so far意為“到目前為止”，它習慣上要與現在完成時連用。
24. —Do you think we should accept that offer?
—Yes, we should, for we ______ such bad luck up till now, and time ______ out.
A. have had; is running B. had; is running
C. have; has been run D. have had; has been run
分析：A。根據句中的up till now可知，第一空應填現在完成時，故可排除B和C；run out的意思是“（時間）流逝”，為不及物動詞，以時間名詞作主語時，沒有被動語態，故可排除D。
25. —Have you known Dr. Jackson for a long time?
—Yes, since she ______ the Chinese Society.
A. has joined B. joins C. had joined D. joined
分析：D。since she join the Chinese Society為I have known Dr. Jackson since she join the Chinese Society之省略。連詞since所搭配的時態通常是：主句用現在完成時，從句用一般過去時。
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