Условие задания:

4,5 Б.
Look at the sentences below. Choose the right answer.
1)  The man never cleaned his office. He left a ________ of files and papers on his desk.
2)  I was so happy to see a _______ of quails on the country road.
3)  Last Sunday, I went with my friends to the park. We had to eat our lunch quickly because an _______ of ants attacked our food.
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