When I went to bed last night, I __21__ asleep immediately. I must have been tired because I had been working so hard for several hours. So I forgot to close the windows before getting into bed. If I had remembered, the thief would not have got in. But __22__ a perfect opportunity to enter the house. The next time I __23__ late I will lock the house carefully.A policeman came to see me about the thief. "I have been told to investigation," he said. "So I __24__ ask you some questions. First, how __25__?" I told him that I had left the windows open. "You should be more careful." He said. "If people looked after their houses properly, we wouldn't have so much work to do."
选项：

A:he was given
B:work
C:want to
D:did the thief get in
E:fell