Complete the sentences with the Passive form of the verbs in brackets.

1 Billions of emails ... every day.  (send - Present Simple)
2 Mobile phones ...  (use - Present Perfect)
3 The message ... by James.  (not write - Past Simple)
4 Mobile phones ... in class.  (turn off - must)
5 Ball games ... here. (play - can't)
6 My stolen bike ... yet.  (not find - Present Perfect)