汉译英：（1）我的哥哥是大学教员，他教经济学。 （2）我已经长大，完全可以自己决定。

简单点的翻译如下：
1. My (older/elder) brother is a college/university teacher, who teaches economcs.
2. I've grown up, and/so I can decide (it) completely by myself.
3. Generally speaking, my reaction反应/response反映 is good.
generally speaking也可以换写成in general, on the whole等。
4. How long have you been married?
动词marry不能延续，不能跟how long，但是be married可以。
5. Why do you hate/dislike this (kind of) medicine so much?
注：/ 表示可以任意选用其一，（ ）表示可以省略不写。