1. Open your book on page 20.
=> You should say: Open your book to page 20.
2. OK! Time's over!
=> You should say: Time's up.
3. Pat attention in the example.
=> You should say: Pay attention to the example.
4. Does anyone have any doubts?
=> You should say: Does anyone have any questions?
5. Today we are going to discuss about the politics.
=> You should say: Today we are going to discuss politics.
Jirapat 010 3EN