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.