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18 Put the verbs in brackets into the correct form and read the joke. (to buy) a parrot which could already talk. However,
the man soon ... (to discover) that the parrot mostly
(to be) funny, but then
bad words. At first he ... (to think) it
important guests, the bird's bad words ... (to embarrass) him
it ... (to become) tiresome, and finally, when the man
very much. As soon as the guests ... (to leave), the man angrily
(to shout) at the parrot, «That language must stop!» But the
bird ... (to continue) saying bad words. Now the man
really angry. He ... (to grab) the parrot and
the refrigerator. But it ... (to have) no effect. From inside the
refrigerator, the parrot still... (to say) nasty words. Then the man
(to open) the door of the freezer,
and ... (to close) the door. This time there ... (to be) silence. After
(to be)
(to put) it into
(to throw) the bird into it,
two minutes, the man... (to open) the door and ... (to remove) the
very cold parrot. Slowly the shivering parrot
(to walk) up the
man's arm, ...
(to sit) on his shoulder and ... (to speak) into his
ear, sounding very frightened, «I'll be good, I promise... Thos
chickens in there... . What ... they ... (to say)?»

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Пошаговое объяснение:

32,2 - 28,7 = 3.5  км\ч    - скорость против течения реки

32,2 + 3.5 = 35,7 км\ч  скорость парохода по течению реки

28,7 * 0.7 = 20.09 км  - роплывет пароход если будет двигаться 0,7ч против течения реки

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