6. видно слова Sunday now, поэтому He isn't working at the office, he is reading at home.
7. I haven't seen you.... Are you busy at work? - I'm having an awful week, you know.
8. What was he doing... He wasn't doing anything really. He was just looking...
9. We are having... I'm sorry to...
10. has happened, has swallowed
11. She asked me if I had seen her backpack.
12. had done, went.