题目内容：

阅读下面短文，用括号内的所给的动词的适当形式填空，必要时可加助动词或情态动词。

   Middle school life is coming to an end. Different students have different memories(记忆). Let’s take a look at two of the unforgettable memories.

   Li Xiaohui, 15

   My most unforgettable experience was the running for the PE test. When I   1   (run), I was too tired to go on. all my classmates came up to me and cheered me up. their encouragement helped me finish the run! I   2   never    2   (forget) it!

   Gao Mingyi, 16

   The most important one to me was my English teacher. Last year, when she   3    (know) I had given up an English-speaking contest, she told me, “any opportunity is important and you don’t know the result until you   4   (finish) it. Don’t give up easily.” Later on, I made my good use of every opportunity I had and achieved good results.