—The exam was easy,wasn't it?—Yes,but I don’t think could pass it.
. Mr Smith is ______ a good teacher ______ we all respect.
_______ a chance, we are bound to visit the 2010 Shanghai EXPO.
The doctors did all they could _______ him _______.
-- You speak very good English! -- Thanks. I_______ English since I was a small boy.
_______ my teachers’ help, I wouldn’t have succeeded.