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。
There are more than two (千) students in our school.
He didn't go to bed (直到)his father returned home.
My mother was busy cooking in the (厨房).
It is (可能) for us to finish the work in such a short time .
Tonny has been (收集) seashells for four years..
