27 to turn ( tell sb to do sth)
28 to post ( forget to do sth 忘记去做某事
29 sing ( hear sb do sth)
30 not to come
31 to have ( stop to do sth 停下来去做某事
32 sells
33 joined
34 be stored ( 被动事态）
35 had disappeared
36 hung
37 decorated
38 borrows
39 were picking
40 cost ( 一般过去时,cost 的过去式是cost）