1) met; was walking
2) was writing; saw
3) were you doing
4) fell; was running
5) was playing; entered
6) got
7) was waiting; arrived
8) was picking; cut
9) was paying; heard
10) was reading; heard
11) met; was doing
12) was waking; was raining
13) were you doing; came in
14) did you see; was standing
15) was playing; saw
16) were fighting; arrived
17) travelled
18) was sitting; arrived
19) was looking; saw
20) were dancing; were listening
21) did he hear
22) were walking; were enjoying
23) was traveling; lost
24) came; were staying
25) was sanding; was typing
Удачи в учёбе!