Помагите с тестом по иностронному языку нужно вставить правильное слово

1There are a lot of ........ in the forests of Kazakhstan

a) wolf


d) wolves
2 Sguirrels eat a lot of...........

a)leaves d)leaf

3 I have seen a lot of .............. in the zoo of the U.K.

a) rhinos d) rhino

4 Wolves have sharp...........

a) teeth d)tooth

5 There are a lot of........

a)children d)child