Walmart，which is one of the largest American supermarket chains，________ some of its stores open 24 hours on Mondays through Saturdays.(2012·安徽)

Look! Our Chinese teacher, Mr Zhang, is playing badminton there.—-No, it ________ be Mr Zhang,. He has gone to Guangzhou for a meeting.

I am good at math, but his English is ________ thanmine.

Who has rice of the three children Kitty does.

May I speak to Xiaofang ______,please. I am going to ask her to come.