Calculating the reciprocal is one of the basic skills in mathematics.

After the earthquake, the number of dead increased rapidly.

He read scores of books.

It is important to calculate the subtrahend accurately.

He thought for a few seconds before giving an answer.

He has a habit of smoking tobacco every day.

I bought a new sweatshirt.

Swansea is a beautiful city in Wales.

Hard water contains a lot of calcium and magnesium ions.

He is the centre of the team.