Before getting on the train, you need to (show your pass / fasten your seatbelt / put on lip balm)
show your pass
It’s very hot in my room, so I will (turn off the heater / turn on the heater / use the socket).
turn off the heater
My hands feel dirty, so I will (brush my teeth with a toothbrush / apply sanitiser / carry a shopping bag).
apply sanitiser