Miss Fang: Hello, children. This is Mr. Xu. He's a fireman. Let's welcome Mr. Xu.

Mr. Xu: Thanks. Let's talk about ____safety today. Fire can burn down trees. It can ____people, too. We must be ____with fire. What mustn't we do in the forest or at home, children?

Peter: We mustn't ____in the forest.

Kitty: We mustn't play near fires or play with ____at home.

Mr. Xu: Very good. Safety first.

如图，在纸上剪下一个圆形和一个扇形的纸片，使之恰好能围成一个圆锥模型，若圆的半径为r，扇形的圆心角等于120°，则围成的圆锥模型的高为（　　）

如图是某月的月历，竖着取连续的三个数字，它们的和可能是（　　）

列举封建性质的改革两个____、____。