1、which boy student will the headteacher have_stayed__in the classroom?（stay）
2、to the children's__sadness___,their favourite pet parrot died suddenly.they cried a lot___sadly___and looked even_sader__(sad)
3/of all the tourists,maybe mr.black is___the most thirsty___(thirsty)
4/the dollars in the purse can;t be___anyone else___(someone else)
5/farmers make money by_selling__(sell)rice.