The molecule becomes optically active because it has a single chiral centre at the third carbon.

Many new shopping centres opened on the outskirts of the city last year.

The finance team restructured several cost centres to improve budget transparency.

Human rights groups visited the detention centres to document living conditions and advocate for better treatment.

After the protest, several activists were taken to the detention centre for questioning.

After school, the children spent two hours practicing laps and diving drills at the new aquatic centre.

The new health centre on Elm Street opened last month to serve underserved families.

The coach praised the centre-backs for their composure under pressure during the final.

The centre-half led the defense with calm authority during the crucial match.

The centre halves communicated well to repel every attack during the match.