Our teachers are very strict ______ us in class, but they are kind _____ everyone after class.

I don’t think the snow will _____ our plansfor a picnic.

When you go outing with your sisters, you must see to_____ that they are safe. 　　[ ]

下列各组中标点符号使用正确的一项是（）

下列句子中加点的成语运用错误的一项是（2分） 