On a cold winter night, a kerosene heater is indispensable.

On cold days, a heater is necessary.

His tooth chipped while he was eating ice cream.

Daily exercise is indispensable in my life.

Oil is an important element of the world economy.

On cold days, warm coffee is the best.

On a cold winter night, hot cocoa is the best.

The cold has become severe.

It's very cold today, isn't it?

It's difficult to go outside in this coldness.