Ⅰ.单句语法填空
1.When he looked to the side,he saw (instant) that it wasn’t a dog at all,but a wolf.
2.An excellent teacher won’t tolerate (cheat) in the examinations.
3.I (encounter) many hikers who were headed to a distant campground with just enough time to get there before dark.
4.Once ecosystems pass their tipping point (临界点),it is (remarkable) difficult for them to return.
5. (prepare) others for a conversation of fun is as good as telling a joke yourself when showing your sense of humor.
6.Simply (keep) a diary that keeps track of friends’ birthdays and other important dates will make sure nothing slips by you.
7.Every weekend, (have) a great time is the order for both audiences and comedy stars in “Wales” premier comedy club.
8.It’s no use (discuss) with him about the question,for he won’t change his mind.
