Many people believe that hunger is only a problem in the developing countries.________, it is a problem all over the world.
What did he say? I don’t know what________.
I told your friend how to get to the hotel, but perhaps I______have driven her here.
I’m sorry to have hurt you, but I didn’t do it________.
It is the first time that I_______to Beijing.
----Must I do well in all the subjects, Mum? ----Sure, baby! As an old saying goes, knowledge is _________.