Решение:
Выбираем правильные формы глаголов прошедшего времени:
- He didn't climb a mountain. He climbed a tree.
- She didn't wash the floor. She washed her teeth.
- They played volleyball. They played tennis.
- He didn't wait for a train. He didn't wait for a bus.
- They walked on the beach. They walked in the park.
- She didn't clean the dishes. She cleaned her hair.
Ответ: didn't climb, climbed; didn't wash, washed; played, played; didn't wait, didn't wait; walked, walked; didn't clean, cleaned.