A:feel
B:to feel
C:felt
D:feeling
春秋时期首先当上霸主的是( )
414-238=
如何使氢氧化钙尽快的溶解于水?回答三种方法.
A:What's the matter?
B:I have ____ ____.
A:I'm sorry to hear that.____ ____.
B:Thank you.