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15. — I (to be) sorry I can't join you: I (to translate) the article on economics for three hours. It (to be) the most complicated text I (to translate) ever.
16. Yesterday when I (to listen) to music the tape-recorder (to break) down. I (to ask) my parents for some money, but I (not to be) sure they (to give) me enough money to buy a new tape-recorder.
17. Two months ago I at last (to visit) my native town. When I (to walk) down its streets I (cannot) recognize anything because everything (to change) so much.
18. One fine afternoon I (to sit) in my study in a small town on the west coast of England. It (to be) five o'clock in the afternoon. I (to finish) my work for the day and (to rest) quietly in my armchair, thinking of the days that (to go) by, especially of those happy days that I (to spend) on the Coral Islands in the Pacific. Six years (to pass) since the day of my return to England.
19. When we (to arrive) at the airport we (to understand) that the plane (to land) safely.
20. She (to want) to know who (to come) to see her off.
21. Mark Twain (to ask) the conductor to wake him up. He (to warn) the conductor that he (to be) a very heavy sleeper and (to protest) loudly when he (to try) to wake him up. In the morning Mark Twain (to realize) that the conductor (to forget) about his request. He (to say) he (to be never so angry in all his life/ The conductor (to look) at him calmly and (to say) that the American whom he (to put off) the train (to be) even more angry.
22. After I (to find) the phone number I (to come up) to the telephone that (to hang) on the wall and (to take up) the receiver.
23. Before I (to visit) Australia, an Australian friend in London (to tell) me about the 'Australian salute'. I (to visit) never Australia before and I (to enjoy) my stay. I (to swim) every day from the time I (to arrive). Yesterday, an Australian friend (to invite) me for a tour into 'the bush'. The first thing I (to notice) (to be) the flies. Suddenly, as I (to wave) my right hand to keep away the flies my friend (to say): "That (to be) the 'Australian salute' ".

15. am, have translated, was, had translated16. listened, broke, asked, wasn't, would give17. visited, walked, couldn't, changed18. sat, was, finished, rested, went, spent, have passed19. have arrived, understood, landed20. wanted, came21. asked, warned, is, protests would try, has realized, forgot, said,has never been so angry, looked, said, put off, was22.have found, came, hung, took up23. visited, told, had never visited, enjoyed, have swum, arrived, invited, have noticed, was, have waved, said, was