Complete the second conditional sentences with the correct form of the verbs in brackets.
1 If I
(find) someone's mobile phone, I
(call) the first number in their phone book to tell them.
2 What if all the computers in the world
(fail) at
the same time?
3 Supposing your best friend ___
(tell) you a lie,
how
(you/react)?
4 If I ___
(not surf) the internet so much, ___
(not keep up with) the latest games.
5 If you
(not spend) so much time chatting to
strangers online, you ___
(have) more time for
your real friends.