1.Turn off: to stop the flow electricity, gas,etc.
Please turn the television off before you go to bed.
2.get through: to make somebody understand or accept .
I find impossible to get through to her.
3. catch on with :to become popular or fashionable.
He invented a new game, but it never really catch on.
4. show SB off: to show people Sb/St that you proud of.
She wanted Show off her husband at the party .
5. Sit on: to received a letter or report ,etc from Sb and not replied or taken any action .
They have been sitting on my application.
6. Call on: to formally invite or ask Sb to speak.
I now Call on the chairman to address the meeting.