语法填空
1. (2018·全国卷Ⅱ)Corn production has jumped nearly 125 percent over the past 25 years, while rice has increased only 7 percent.
2. (2019·全国卷Ⅱ)When we got a call saying she was short-listed, we thought it was a joke.
3. (2018·全国卷Ⅰ)If you are time poor, you need run for only half the time to get the same benefits as other sports, so perhaps we should all give it/running a try.
4. (2018·全国卷Ⅲ) When the gorillas and I frightened each other, I was just glad to find them (they) alive.
5. (2018·全国卷Ⅲ) I was searching for these three western lowland gorillas I’d been observing. No one had seen them for hours, and my colleagues and I were worried.
6. (2019·全国卷Ⅰ)Modern methods of/for tracking polar bear populations have been employed only since the mid-1980s, and are expensive to perform consistently over a large area.
