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I decided to become a teacher [in|at|under|on] the age of seven, when I met my first teacher. She was beautiful and kind. She was always patient [about|to|after|with] us even though we were sometimes naughty and noisy. I think she was popular [about|with|to|for] every pupil in my class.

I can still remember the day when I started my career [with|for|in|of] education and my first lesson. It was quite scary to realise that I was [in|on|at|for] charge of the whole class now. [At|In|For|On] the beginning of the lesson, I was a bit nervous [with|of|to|about] the discipline. But everything was OK.