Hearing the joke,all the students burst into ______ laughter

Hearing the joke,all the students burst into ______ laughter the s news made all of us burst into laughter At that joke,tom burst into laughter为什么用at Hearing the bell ring,the students stopped (joke) _____ with burst into laughter/tears Hearing the ______ news, all the students looked ______ at t After I told him the story,he suddenly burst into laughter. burst into laughter等于什么 Hearing the final___ ,all the people in the stadium burst in when he hearing the news.he burst into tears?怎么改错 ( )hearing the news,he burst into tears请问填什么介词,为什么不能用after 请把下列句子改为时间状语从句：Hearing the news,she burst into tears