Harry Potter first ________ in 2001 and attracted a large number of people.

Is Jack on duty today? —It ______ be him. It is his turn tomorrow.

That girl is _____ young to know _____. [ ]

Shanghai is the city ______ the 2010 world Expo is held. –So it is a city____ most of us want to vist this summer.

How is your mother? She is __________.