A:气球太轻
B:没有外力作用
C:气球的喷气方向在不断变化
男女生之间不可能建立纯真的异性友谊,因此男女生尽量少交往。( )
____ ____ ____ ____ ____ ____ ____ ____ ____
—The weather turns out to be fine.
— We can depend on ___ that the goods will be shipped to the flooded area on time.