Jack wasn't saying anything, but the teacher smiled at him __________ he had done something very clever.
U.S.President Barack Obama arrived in China’s economic center Shanghai on Sunday night, November 15th 2009, ___ a state visit to China.
I hope you don’t mind me asking, _____ where did you buy those shoes?
How cold it is! We’ve never had ______ this winter.
Jane was asked a lot of questions ,but she didn’t answer ________ of them .
Of the two brothers, Bill is ____ younger one, and he is a quiet boy, ____ the most adults like very much.