1. Yesterday at 5 o’clock I a cake .
A ate B was eating
2. I a delicious cake yesterday.
A ate B was eating
3. She at the party last Saturday.
A danced B was dancing.

1. Yesterday at 5 o’clock I was eating a cake .

2. I ate a delicious cake yesterday.

3. She was dancing at the party last Saturday.

1-B. 2-A. 3-B (но это не точно)

Объяснение:

1-потому, что это длительное действие происходящее в определенное время

2-потому, что время не указанно.