A)
1.bought
2.came
3.went
b)
1.Did Jake buy a nice jacket last month?
2.Did the boys come to school at 9 o'clock yesterday?
3.Did I (you) go to the seaside last summer?
c)
1.Jake didn't buy a nice jacket last month.
2.The boys didn't come to school at 9 o'clock yesterday.
3.I didn't go to the seaside last summer.