Complete the text with the correct form of the words in capitals. there is an example at the beginning (0).the songs of the humpback whale are beautiful (0) collections of moans and sighs and it is possible to make (1) of these with a microphone.with enough (2) you can listen to a song and tell which year it was sung in and where it came from. whales do most of their (3) in the winter season,after their annual (4) south from the arctic. it is always the young males who set off first to the tropical breeding areas,and most of the (5) are given by solitary males who are looking for a mate.the songs all have a definite sequence of parts. this (6) is never changed, and there are clear rules of (7) which must not be broken. there is very little (8) between the songs at the start of a season and those from the previous year. however, over the next few months, the different parts of each song may be swapped, shortened, and (9) may be made to the notes. during a breeding season, the whales all try to sing the most up-to-date version of the song. (10) is similar to the way human language evolves, with contributions from many members of the population. 0) collect 1) record 2) practise 3) sing 4) migrate 5) perform 6) arrange 7) compose 8) differ 9) alter 10) develop

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