Ответы

Упражнение 1.

1 are, 2 is, 3 is, 4 are, 5 is, 6 is, 7 are, 8 is, 9 is, 10 are, 11 are, 12 is, 13 are, 14 is, 15 are, 16 are, 17 is, 18 is, 19 are, 20 is.