Okay, let's fill in the gaps in the dialogue with the provided words:
Sandra: You (a) **were** at school yesterday.
Mike: Where (b) **were** you?
Sandra: What (d) **was** wrong?
Mike: Sorry, I (c) **couldn't** come.
Mike: I don't know, but my mum (e) **wasn't** well, see that I (f) **could**.