单句语法填空
1. (2018·全国卷Ⅱ)Corn uses less water than rice and creates less fertilizer (化肥) runoff.
2. (2019·全国卷Ⅱ)I work not because I have to, but because I want to.
3. (2019·全国卷Ⅲ)On our way to the house, it was raining so hard that we couldn’t help wondering how long it would take to get there. It was in the middle of Pearl City.
