During our stay in London, the guide book ___ a great help. We all had a wonderful time.A. behaved B conducted C. served D. proved
He prefers _____books at home rather than ______TV.
John, look at the time._____ you play the piano at such a late hour?
I was just talking to Mary when Jack _____
_______him and then try to copy what he does.
—You are saying that everyone should be equal, and this is ________I disagree.