用come about,happen,take place,break out,occur的正确形式填空

用come about,happen,take place,break out,occur的正确形式填空
1.I was out of town at the time ,so I don’tknow exactly how it ______ 2.The meeting _________ at 8:00 as planned 3.It________ to rain that morning 4.A fire _________ in the hotel last night 5.It suddenly ___________ to me that I hadleft my key in the office