( ) -- This is a book Changjiang. -- It’s very nice. A. at B. about C. on
( )—Whose dresses are these? —They’re the__________.
( ) —When is your birthday? —It’s__________
( )—I usually go there by train. —Why not__________ by boat for a change?
( )His family__________ all very kind and friendly. His family__________ a happy one.
( ) Because he is the tallest in his class,__________ he sits at the back of the classroom.