1. My friend _______ climbed a volcano. 2. My sister and my brother _______ dived near a coral reef. 3. I _______ been bungee jumping. 4. My best friends _______ walked under a waterfall. 5. That astronaut _______ walked on the moon. 6. She _______ canoed on a river. 7. My dog _______ eaten his dog. 8. My cats _______ played a lot. 9. We _______ done our homework. 10. It _______ climbed a cliff.

Краткое пояснение:

Пошаговое решение:

1. 1. My friend (единственное число) _______ climbed a volcano. — Используем 'has'.
2. 2. My sister and my brother (множественное число) _______ dived near a coral reef. — Используем 'have'.
3. 3. I _______ been bungee jumping. — Используем 'have'.
4. 4. My best friends (множественное число) _______ walked under a waterfall. — Используем 'have'.
5. 5. That astronaut (единственное число) _______ walked on the moon. — Используем 'has'.
6. 6. She (единственное число) _______ canoed on a river. — Используем 'has'.
7. 7. My dog (единственное число) _______ eaten his dog. — Используем 'has'.
8. 8. My cats (множественное число) _______ played a lot. — Используем 'have'.
9. 9. We (множественное число) _______ done our homework. — Используем 'have'.
10. 10. It (единственное число) _______ climbed a cliff. — Используем 'has'.

Ответ:

1. has climbed a volcano.
2. have dived near a coral reef.
3. have been bungee jumping.
4. have walked under a waterfall.
5. has walked on the moon.
6. has canoed on a river.
7. has eaten his dog.
8. have played a lot.
9. have done our homework.
10. has climbed a cliff.