Put the verbs in brackets into the past simple or past continuous. 2 Peter (turn on) the TV, but nothing (happen).

Peter **turned on** the TV, but nothing **happened**.
Explanation: Both actions are completed actions, and we use simple past: 'turned on' and 'happened'. The action of turning on the TV has no relation to another ongoing action so it must be simple past. Same with the action of nothing happening.