题目

81. We are about leaving when it begins to rain. 82.The task is difficult but her determine expression let me know she would not give up. 83.Please add to your score and see how many points you get. 84.There were so many work to do that they had no time to rest. 85.The workers on strike had to give in the police. 86.She is having some troubles with her classmates at the moment . 87.She is a lovely girl and she has a serious shortcoming. 88.After hearing the news, she couldn’t help run tears from her eyes. 89.The organizer said that they will begin the plan the next day. 90.The boy a已知集合A={x|x2-x-12＜0}，集合B={x|x2+2x-8＞0}，求A∩B，A∪B．