Put a general question and a special question to each sentence.
4. Where(второе)

1. Did mother give us milk for breakfast yesterday?

What did mother give us for breakfast yesterday?

2. Did you get up at 6 yesterday morning?

When did you get up yesterday morning?

3. Did Helen play chess with you yesterday morning?

With whom did Helen play chess yesterday morning?

4. Did my friend's aunt live in London?

Where did my friend's aunt live?

if they really wanted to do that and imprint on some material thing they could buy a camera at the local store regardless of higher price.

how do you keep fit?

при построении вопросительного предложения сначала ставится вопросительное слово (в данном случае это "how"), затем глагол (do), затем подлежащие и сказуемое