The key answer of exercise 5

a)

1. Did you go on holiday last year?
2. Did you have a good time?
3. Did you meet (your) friends last night?
4. Did you speak English yesterday?
5. Did you have breakfast this morning?

b)

1. Yes, we did. We went to Greece.
2. Yes, we did. We had a great time. We stayed in a good hotel.
3. No, I didn't. I stayed at home and watched a film on TV.
4. Yes, I did. I spoke English with my teacher.
5. No, I didn't. I wasn't hungry and I was late.