Complete the sentences with the correct form of the verbs in Exercise 4.Then listen and check.
1)Don't forget to switch off the lights before you
go to bed.
2)Can you ... the heating? It's really warm.
3)You shouldn't... the TV at night
4)Did you know your computer ... a lot
of electricity?
5)It's better to have a shower than a bath because
you don't ... so much water.
6)You should try to the number of hours you use
the air conditioning.
7)We're trying to so I always switch off my computer when I'm not using it.
