单句语法填空
1．(2020·新高考全国卷Ⅰ)As well as looking at exhibits, visitors can play with computer simulations (模拟) and imagine themselves (they) living at a different time in history or walking through a rainforest.
2．(2020·全国卷Ⅰ)Data about the moon's composition, such as how much ice and other treasures it contains, could help China decide whether its (it) plans for a future lunar (月球的) base are practical.
3．(2019·天津卷改编)A study shows the students who are engaged in afterschool activities are happier than those who are not.
4．(2019·北京卷)For the past 20 years, I have lived by these words.Soon I will graduate and become part of the real world.Nervously facing challenges, I know I will whisper to myself(I) the two simple words “Be yourself”．
5．(2018·全国卷Ⅰ)Running is cheap, easy and it's always energetic.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 a try.
6．(2018·全国卷Ⅲ)When the gorillas and I frightened each other, I was just glad to find them (they) alive.
7．(全国卷Ⅱ)However, the railway quickly proved to be a great success and within six months, more than 25，000 people were using it every day.
