某同学做了如下实验：把点燃的一支蜡烛伸进盛有氧气的干燥集气瓶里，燃烧停止后，冷却，可观察到瓶内壁上有____ 附着，由此说明蜡烛燃烧产物中有____ ；取出蜡烛，向瓶内注入少量澄清的石灰水，振荡，可观察到的现象是____ ，由此说明蜡烛燃烧产物还含有____ 

北宋画家张择端画的长卷____，是北宋时期都市生活的真实写照。

This is my school. There are many trees and flowers in it. The teaching building is big and tall. There is a big playground in our school. After 4:30 in the afternoon, many students come to the playground to play football and some students play table tennis in the table tennis room.
There are 1,200 students in 25 classes in our school. The students all like to study. The teachers in our school are very good. They help the students to study and the students like them, too.