函数$y=\sqrt{x-4}$中，自变量$x$的取值范围是（     ）

①热心公益，服务社会               ②积极践行社会主义核心价值观

③从身边做起，从小事做起      ④承担责任必然伴随着获得回报的权利

根据所给音标、汉语或首字母提示写出下列句中所缺单词。

Don't forget to____ /nɔk/ at the door before entering the meeting room. 

The new law is so strict that it doesn't____ / ə' lau/ any indoor smoking.

He got____ /drest/ quickly after taking a shower.

People throw l____  into the river and make it really dirty.

Nobody knew what to say and they just sat there in s____ .

The medicine should be taken t____  a day after meals.

When he grew up, he turned into an____ （诚实）and helpful person.

It's said that the terrible weather in this____ （季节）caused the ship accident.

A sweeping robot is____ （确切地）what I want for my house.

The fantastic world surely ____ （属于）to young people and the future.