Liu Mei has a h____ family. She lives w____ her grandparents and parents in Dantu. Her father is a doctor. He goes to work o____ foot every day. He is not very tall, b____ he is very strong. Her mother is a teacher. She goes to work by car. She often h____ her students at school. Liu Mei's grandparents stay at home. In the morning, they go t____ the park. In the afternoon, they d____ tea with their friends. In the e____, they watch TV .Liu Mei is a student in No.1Middle School. Her school is beautiful. There are many tall b____ there. She wants to s____ everyone around her school. She likes it very much.

一位老农养着一匹老马。一天，老马不小心掉进了一个深坑，发出一声声哀鸣。望着深坑里的老伙计，老农痛心却又无奈，他知道自己无力救老马出来，但又不忍心让它因为困饿，痛苦而死，于是决定往坑里填土，尽快结束老马的生命。

当老农开始往深坑里填土时，老马吓坏了，但几乎在同时，老马又镇定下来，每次土打到背上，它都用力抖掉，然后踩着投下来的土往上走一点。不管土块打在背上有多疼痛，老马从不放弃抖土。不知过了多久，筋疲力尽、伤痕累累的老马终于安全地回到了地面。原来是埋葬它的泥土，最终却拯救了它。

设m、n是不同的直线，$\alpha ,\beta ,\gamma$是不同的平面，有以下四个命题：
①．$\left.\begin{array}{c}\beta \parallel \gamma \\ \alpha \parallel \gamma \end{array}\right\}\Rightarrow \alpha \parallel \beta$  ②．$\left.\begin{array}{c}\alpha \perp \beta \\ m\parallel \alpha \end{array}\right\}\Rightarrow m\perp \beta$
③．$\left.\begin{array}{c}m\perp \alpha \\ m\parallel \beta \end{array}\right\}\Rightarrow \alpha \perp \beta$  ④．$\left.\begin{array}{c}m\parallel n\\ n\subset \alpha \end{array}\right\}\Rightarrow m\parallel \alpha$，其中正确的命题是(   )