Choose the correct answer :

1- We are nearly home! We must get ( on – off – up – down ) the train at the next station.

2- You ( must – can – can't – mustn't ) touch the bare electric wires.

3-I go to the airport to take the ( train – plane – bus – car ).

4- What can become unhealthy when animals and ( insects – cars – planes – buses ) use it.

5- Bilharzia is a ( canal – disease – medicine – pool ) which people can get from swimming.

6- Water is safe ( to – too – two – for ) drink if you boil it.

7- ( Animals – Plants – Flies _ Scales ) are very dirty insects.

8- ( Can – Must – Mustn't – Are ) you help me , please ?