下列各句中均有一处错误，指出并改正。
【小题1】(2019·全国Ⅲ)Though it may appear simple, it required a lot of ideas and efforts.
【小题2】(2018·全国I)During my last winter holiday, I went to the countryside with my father to visit my grandparents. I find a big change there.
【小题3】(2018·全国II)I didn’t realize how right my parents are until I entered high school.
【小题4】(2017·全国I)Once I started the car, my mind goes blank.
【小题5】(2017·全国Ⅱ)When summer came, they will invite their students to pick the vegetables！
【小题6】(2017·全国Ⅲ)About one month after this photo was took, I entered my second year of high school and became a new member of the school music club.