男女老少都参加了战斗。
参考答案：
Men and women, old and young, all joined the battle.
已知三角形的各边长分别是8cm、10cm和12cm，则以各边中点为顶点的三角形的周长为______cm．
根据句意及首字母提示补全单词。
1. The p_____ of this passage is to talk about a program that helps homeless people.
2. A_____ Jim's uncle is old, he looks very strong and healthy.
3. I have made p_____ for the coming test.
4. There will be an important c_____ in the meeting room this afternoon.
5. The students are doing physics e_____ in the lab.
