1 came/were discussing
2 was typing/came in/put
3 leaved/was raining
4 returned/saw/was doing
5 are you doing/came
6 wrote/was taking
7 was sitting/was ridding
8 came/was sitting/was playing/told/was making
9 were glittering
10 looked up/were listening
11 noticed/wore
12 happened/was having dinner
13 came/were sitting
14 was playing
15 went/was raising/opened