根据句意及汉语提示，填入恰当的单词。
1. The teacher spent about 20 minutes in explaining this (段落).
2. More (最近), he’s appeared in a number of British films.
3. The policemen caught three (恐怖分子) in this hotel thre
e days ago.
4. The clock (塔) stands over 10 meters tall.
5. It was too late when she (认识到) her mistakes.