Ⅰ.单句语法填空
1．How could you enter into my office by yourself without my ____________ (permit) during the work time?
2．The final objective of city greening is to make our environment more comfortable for us to live in, but not just make our ____________ (surround) green.
3．Some also point out that youngsters can ____________ (broad) their horizons and increase their social contact through these shows.
4．While ____________ (wait) for the train, I had a long talk with my younger sister about her work.
5．It was not until that night that Tom realized how serious his ____________ (injure) was—he didn't even remember the game he had just played!
6．They asked me whether I ____________ (go) to the West for teaching.
7．There are some health problems that, if not _____________ (treat) in time, can become bigger ones later on.
8．My teacher advises me to keep all options open before ____________ (decide) on what I really want to do.
