题目

一条光线从水中斜射入空气，画出大致的折射光线。 答案：用所给词的适当形式填空。1. The good news _____ (make) us so happy.2. It's _____ (rain) outside. We have to stay at home.3. Look, there are so many people _____ (wait) for the bus.4. My cat _____ (lie) under the desk now, it's so cute. 5. Some students are busy _____ (clean) the classroom.