13. Sarah (climb) ________ the Matterhorn, (sail) ________ around the world and (go) ________ on safari in Kenya by the time she turned twenty-five. She (experience) ________ more by that age than most people do in their entire lives.

Решение:

В первой части используем Past Perfect Continuous, так как действия (climb, sail, go) происходили до определенного момента в прошлом (by the time she turned twenty-five) и продолжались.

Во второй части используется Past Perfect, так как "experience" описывает накопленный опыт до указанного момента.

1. Sarah had been climbing the Matterhorn,
2. had been sailing around the world and
3. had been going on safari in Kenya by the time she turned twenty-five.
4. She had experienced more by that age than most people do in their entire lives.

Ответ: had been climbing; had been sailing; had been going; had experienced