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21. How long ... you … for a telephone call?-Since 2 o'clock.
a) do wait b) have been waiting c) has waited
22. Before the company went bankrupt, it ... money for months.
a) have been losing b) has been losing c) had been losing
23. It … for three hours when I left home.
a) was raining b) rained c) had been raining
24. My younger brother has been playing tennis … he was five.
a) since b) from c) during
25. I haven’t been to my native town … 10 years.
a) since b) from c) during