1. _e_ What happened when they were waiting for the bus?
e. It started to rain.
2. _b_What were the students doing when the teacher came to the classroom?
b. They were reviewing their notes.
3. _f_ What were the children doing in the park while their moms were chatting?
f. They were playing hide-and-seek in the garden.
4. _a_ Were you watching TV when I called you yesterday?
a. No, I was listening to some English songs.
5. _c_ Did you break your leg while you were playing soccer?
c. Yes, then I had to stay in the hospital for two weeks.
6. _d_ Why didn’t you answer my phone?
d. Sorry, I was watering the flowers in the garden, so I didn’t hear the phone ring.