1 let
2 began
3 put
4 rode
5 taught
6 felt
7 threw
8 kept
9 became
10 met
11 blew
12 cost
13 came
14 dug
15 slept
16 drank
17 took
18 fed
19 thought
20 （应该是forget吧）forgot
21 gave
22 wore
23 had
24 made
25 bit
26 caught
27 said
28 cut
29 sat
30 drew
31 swept