Shanghai has hosted2010world Expo The world Expo has longhistory but it has never been held in Asia

Mike is good at _________. He can ________ well.

It is uncertain side effect the medicine will bring about, although about two thousand patients have taken it

Do you know where David is? I couldn’t find him anywhere.—Well. He _________have gone far—his coat’s still here.

21._____by a desire to learn, he was notinterested in children’s play and adventure when he was young.