Li Lei is only 8 years old, _____ he can speak English very well.
Joe, my close friend, moved to Beijing years ago, and I ____ him since then.
______ the problem, Tom has tried many different ways.
She enjoys listening to music rather than _______.
--- Do you like listening to rock music?--- Not really. I prefer light music because it sounds much _______.
---George, how can you prove the earth is round ?--- I can’t, sir. ______ , I never said it was.