下列各句中均有一处错误，指出并改正。
【小题1】(2019·全国Ⅰ)One afternoon where I was in primary school, I was walking by the school playground.
【小题2】(2019·全国Ⅰ)Suddenly football fell just in front of me but almost hit me.
【小题3】(2019·全国Ⅱ)They were two reasons for the decision.
【小题4】(2019·全国Ⅱ)When I studied chemistry at high school, I reconsidered my goal or decided to be a doctor.
【小题5】(2019·全国Ⅲ)In the cafe, customers will enjoy yourselves in the historical environment what is created for them.
【小题6】(2018·全国Ⅰ)At the end of our trip, I told my father that I planned to return every two years, but he agreed.
【小题7】(2018•全国Ⅰ)They also had a small pond, which they raised fish.
【小题8】(2018·全国Ⅱ)The games my parents taught me where I was a child turned out to be very useful later in my life.
【小题9】(2018·全国Ⅲ)Everyone was silent, waiting to see who would be called upon to read his and her paragraph aloud.
【小题10】(2017·全国Ⅰ)Before getting into the car, I thought I had learned the instructor’s orders, so once I started the car, my mind went blank.
【小题11】(2017·全国Ⅲ)I have grown not only physically, and also mentally in the past few years.
【小题12】(2017•全国Ⅱ)In their spare time, they are interested in planting vegetables in their garden, that is on the rooftop of their house.
【小题13】(2017•全国Ⅲ)Around me in the picture are the things they were very important in my life at that time: car magazines and musical instruments.