— _________ has Liu Xiang taken part in world’s competitions of 110-metre hurdles?— I’ve no idea. Let’s find it out on the Internet.

 Daniel plays chess _______ , if not better than , David .

—Scott is good at painting.—Yes, his painting is very beautiful. And he can _________ dance very well.

He often gets up very late. He _________ takes exercise in the morning. 

We __________ used (使用) computers many years ago, but now they’re everywhere.