根据下列句子及所给汉语注释，写出空缺处各单词的正确形式，每空只写一词。

小题1:There are more than two _________(千) students in our school.

小题2:He didn’t go to bed ____________(直到)his father returned home.

小题3:My mother was busy cooking in the ____________(厨房).

小题4:It is ______________(可能) for us to finish the work in such a short time .

小题5:Tonny has been ______________(收集) seashells for four years..

简述多重中断系统中CPU响应处理一次中断的步骤。