Решение:
- The United Kingdom consists of four countries. (Глагол 'consist' в Present Simple, 3-е лицо, ед. число).
- Moscow was founded in 1147 by Prince Yuri Dolgoruky. (Глагол 'found' в Past Simple, пассивный залог, так как Москва была основана кем-то).
- The US President is elected every four years. (Глагол 'elect' в Present Simple, пассивный залог, так как Президента избирают).
- Buckingham Palace serves as the official residence of the British monarch for nearly 200 years. (Глагол 'serve' в Present Simple, 3-е лицо, ед. число).
- Russia has the largest territory in the world. (Глагол 'have' в Present Simple, 3-е лицо, ед. число).
Ответ: 1. consists; 2. was founded; 3. is elected; 4. serves; 5. has.