1. There are large ______（数量）of rain in the area of the country every summer.
2. Scientists have many theories about how the universe first came into ____（存在）．
3. A rainbow is a natural ______（现象） especially after a heavy rain.
4. Such a mistake would perhaps lead to disastrous __________（结果）.
5. The ______（平均数）of 4, 5 and 9 is 6.
6. Several cars are available within this price _______（范围）.
