( )
A:People can cook with it.
B:People can take photos with it.
C:People can tell the time with it.
①他满脸灰尘,双眼布满血丝,衣服破烂不堪,到处都是血迹。____
②褐色的口罩上方,一对眼神疲惫的眼睛吃惊地望着我。____
③他坚定地站起身,向那片废墟走去。____
④我有个慈祥的母亲,她常常对我说:“巴迪,这是你写的吗?精彩极了!”____
开学初,小芳和小亮去文具店购买商品,小芳用18元买了1支钢笔和3本笔记本,小亮用31元买了同样的钢笔2支和笔记本5本,求每支钢笔和笔记本的单价.