Use any or no and the words in the box:
Snow,petrol,teeth,big hills,legs,oxygen.

1.Why is it easy to ride a bike in Holland?
Because there are...

2.Why don't people go skiing in the north of Australia?
Because there isn't...

3.Why can't snakes run?
Because they've got...

4.Why do astronauts need space-suits to survive on the moon?
Because there's...

5.Why are solar cars good for the environment?
Because they don't use...

6.Why can't birds bite?
Because they've got...