Zero and first conditional
* 1 Complete the sentences with these verbs in
the correct form.
are adapt leave watch do
1 If I need excitement, I usually watch
a space documentary.
2 If an astronaut leave the Earth's
atmosphere, he feels weightless.
3 You feel good if you
regular
exercise.
4 If you're old, you don't usually
to new situations very quickly.
5 It's cold in here when all the windows
open.