计算 $\left(\frac{1}{4}-\frac{1}{2}+\frac{2}{3}\right)\times \left(-12\right)$=____ ．

阅读下面的日记，按要求完成任务。

April 12th

Dear Diary,

    Today was Sunday. In the morning I was going to have a picnic with my friends. But it was rainy. So I had to stay at home. I washed my clothes and cleaned the floor. After finishing the work, I was very tired.

    At three o'clock in the afternoon, my cousin Sarah asked me to see a film. I was happy. But I didn't find my pet kitten. Sarah and I looked for him here and there. Guess! Where was he? He was in my cap! When we came to the cinema, it was about four thirty. What a bad day!

Mary

判断（1）~（3）的正误，回答（4）、（5）的问题：