Use the right form of the verbs in Past Simple Past or Past Progressive: a. I(to read) an old book when my sister …(to arrive) home b. At 5 o'clock(to do) my homework c. They(to cook) a tasty cake last Christmas d. They(to write) a letter yesterday at 8 o'clock e. We(to be) happy last winter
I was reading, arrived
I was doing
Cooked
Were writing
Were