The responsibility weighs on me.

Can you spare me a few liters of petrol?

Oil is transported by tanker.

The discovery of oil enriched the country.

Supplies of oil are not infinite.

They substituted coal for oil.

Coal is chemically allied to diamonds.

The coal was glowing in the fire.

The blocks of stone were jointed with cement.

She walked carefully so as not to stumble over a rock.