a) -ed - watched called filled
dc+ed - stopped dropped
-d - dived solved
-ied - cried tried
irregular - found told took call went felt sent
b) 1 found
2 called
3 dived
4 told
5 watched
6 sent
7 cried
8 went
9 felt
10 dropped
11 took
12 stopped
13 tried
14 filled
15 solved