Ответ:

0. Platypuses are kept as pets.

 1 I started to be smart.

2 English is spoken in Australia.

3 He invited me to a party.

4 Interesting films were watched on the plane.

5 English is spoken all over the world.

 6 England is located in the British Isles.

7 People are puzzled by so many names of this country.

8 The warmth of the Irish welcome is best expressed by the proverb

«A stranger is a friend you haven’t met yet.»