Помогите срочно сделать номер 7!

1 b are 2 c in 3 d group 4 a to group 5 b or 6 d they 7 a others 8 c be grouped  9 a are many 10 d them 11 b eat 12 b no 13 b that eat 14 a grown birds 15 c them 16 b eat fish 17 a some birds