how time flies!()more than ten years since i left my hometown.为什么填it is ,而不是there are

题目

how time flies!()more than ten years since i left my hometown.为什么填it is ,而不是there are
；will you mend the cleaner yourself()shall we ask some one else to fix it?and;but;or;so.应该选择哪一个?求理由
第二个句子的意思是什么？

答案