网址：http://m.1010jiajiao.com/timu_id_848396[举报]
_____your sister sad?
A．Are
B．Is
C．Am
D．Be
Tennis ____ my favorite sport.
A．are
B．is
C．am
D．be
There______ some milk in the glass.
A．are B．is C．am D．be
How ______you?
A．am B．is C．are D．be
Here my baseballs.
C．be
D．am