What________is the most helpful invention?
---Sally is ill. Do you know what’s the matter with her? ---Poor girl. Her illness is the_________ of eating unhealthy food.
-It’s Sunday today, so you get up so early.-Yes, I can have a good rest.
-Tom, who taught Chinese before you came to China?-Nobody. I learned it by .
-I don’t know -Because he has to look after his mother.
-My parents our home for a few hours when I arrived. I didn’t meet them.-You could call them if you wanted to know where they were.