Bob worked hard to learn the new math process. His teacher checked his work and told him he was on the ball. What does "on the ball" mean?
Doing a good job
Susie had a really tiring day. She woke up early, went to school all day, then she had a to go to a friend's house to work on a project. That night, she couldn't wait to hit the sack. What does "hit the sack" mean?
Go to sleep
Peter and his friends wanted to build the best racing cart for the race, but their cart broke when going down a steep hill. They needed to go back to the drawing board to make a new cart. What does "go back to the drawing board" mean?
Start over
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