Нужно вставить a.can b.can't c.must d.mustn't 1.fish _ swim but they_fly. 2.a zebra _ ride a bike. 3.an octopus_play computer games. 4.tigers_run and jump. 5.you_be late for school. 6.my sister_read very well though she is only 5. 7.parents_take good care of their children. 8.our teacher _ speak english perfecty. 9.flowers_dance and sing.

1. A, B
2. B
3. B
4. A
5. D
6. A
7. C
8. A
9. B

1.Fish (A) swim but they (B) fly.
2.A zebra (B) ride a bike.
3.An octopus (B) play computer games.
4.Tigers (A) run and jump.
5.You (D) be late for school.
6.My sister (A) read very well though she is only 5.
7.Parents (C) take good care of their children.
8.Our teacher (A) speak English perfecty. 
9.Flowers (B) dance and sing.