We will go to Tian'anmen Square to watch the raising of national flag if it ________ tomorrow.
A:will rain
B:rains
C:doesn't rain
D:won't rain
(2)2= ____(π-3.14)2= ____
一排路灯,原来每两盏之间的距离是40米,现在改为60米,如果起点的一盏路灯不动,至少再隔____ 米又有一盏不必移动.