Ответ:
A1.lake
2.wet
3.jump
4.boat
5.worried
6.middie
7.ago
8.return
9.grabbed
B. 1.didn't swim / swam
2.didn't fall/fell
3.didn't find/found
4.didn't play/plaied
5.didn't take/took
6.didn't put/put
C.2 Did Pete read comics yesterday afternoon?
Yes,he did.
3 Did Pete watch a DVD last night?
Yes,he did.
4 Did Pete go out with friends two days ago?
Yes,he did.