— The weather report says we are expecting another big snow storm tomorrow.
—________ . I planned to go mountain climbing with my classmates.
A:I hope so
B:Bad luck
C:Sounds good
D:I'm afraid so
Mary usually _______ up at five o’clock. ( )
自来水管的内直径是2厘米,水管内水的流速是每秒8厘米.一位同学去洗手,走时忘记关掉水龙头,5分钟浪费____升水.