Sentence Correcting

I went down at the pond, and three kids from my school were there.We fell down again and again, and we laughed so much our stomachs hurt.

I though the lopsided game would never end, and the score just kept getting worse.

Martha thinks she is so cool, but she is not cool to me.

Joe watched a video his mom had bought for him at the store where she works.

Susan loved to watch football, and watched it every Sunday on T.V. Every Saturday she would go to the local college football game. She would always wear the school colors.