用所给动词的适当形式填空： 

小题1:I ____________ (know) the p lace for many years.

小题2:Where is my pen? How strange! It ____________ (be) here just a moment ago.

小题3:He will give the book back to you if he _________ (finish) reading it tomorrow.

简述艾芜小说创作的思想和艺术成就。