—It’s time to go to bed,Li Ming.—Mum,I have a lot of homework to do and I won’t go to bed________I finish it.
The ticket to Nanjing Youth Olympic Games is________, _______ I still keep it.
An old friend of Tom’s always helps both my brother and_ with___ English.
When the _____world was in front of us, we shouted excitedly.
— When did the plane _______? — Half an hour ago.
This umbrella is_______ that one, but _______than that one.