Option 1: "Mom! I got 89 points. If you buy me a gift, I will get 90 points. What is not worth it? " Option 2: "Mom, I got 98 points. Buy me a present! " "(Note: At this time, your mother said that you got 89 points. 98 points. Why? Then you said, "You didn't say you read directly, so you can read backwards! "Mom kind joke, otherwise the somebody else don't give gifts also want to play a few times! ! Option 3: "I refuel. I got 89 points this time, and then I got more than 90 points. This time, you buy me one last gift. If I fail, you won't buy it When the score is above 90, you double it for me! "You can also find a helper: an elder upstairs will buy it for you!