IN:
Multi-choice problem: [he]

The youth outran the old man because he was in shape.

OUT:
The youth


IN:
Multi-choice problem: [they]

The veterans defeated the newcomers because they were less experienced.

OUT:
the newcomers


IN:
Multi-choice problem: [they]

The police arrested 700 protesters in New York since they had to prevent them from blocking the Manhatten bridge.

OUT:
700 protesters


IN:
Multi-choice problem: [he]

The US president had a meeting with the Chinese president, where he told him not to interfere with China's internal policy.

OUT:

the Chinese president