detention

Detention?is a punishment for naughty schoolchildren, who are made to stay at school after the other children have gone home.

jumble (jumble up)

If you?jumble?things or if things?jumble, they become mixed together so that they are untidy or are not in the correct order.?

slate

If you start?with a clean slate, you do not take account of previous mistakes or failures and make a fresh start.?從頭開始; 改過自新

suspend

to officially prevent somebody from going to school or doing their job