Put the verbs in brackets into the past perfect or the past perfect continuous.
16. A: Mum was really angry at me.
B: I know. She.................................... (clean) the house all morning when you stepped in with those muddy shoes.
17
A: Did Salty help you with the dinner party last night?
B: No, we............................................ (prepare) everything by the time she got home.
18
A: Why was Tracy so happy to see her uncle?
B: She........................................... (not/see) him for eight months.
19
A: Was Jenny upset that I called her so late?
B: No, she.................................... (not/go) to bed yet.
20
A: Lisa was exhausted yesterday.
B: I know. She...................................... (study) for a history exam all day.