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.