Gas is a substance in a form like air.

Manually means by hand.

Match is a short, thin stick made of wood or cardboard and covered with a special chemical at one end that burns when rubbed firmly against a rough surface.

Frozen means something turned into ice.

Deliver means to take goods, letters, parcels, etc. to people's houses or places of work.

Operator is someone whose job is to use and control a machine, vehicle, or piece of equipment.

Role is the duty or use that someone or something usually has or is expected to have.

Deal with means to be responsible for a particular job or activity in a company or organization.