21、Look at this．Here’s a pencil case，it’s orange，it’s my pencil case，it’s on the desk.

Look! This is a pen，it’s black．And this is an eraser，it’s blue and white．They’re both（都）in the pencil case．This is a ruler，it’s red，it’s on the pencil case．That is a ruler，too．It’s yellow．It’s in the drawer．Where’s my math book ?Ah，it’ s there，under the sofa．

1．This is_______ pencil case．

A．my                    B．her                      C．his

2．The yellow ruler_______

A．in the backpack    B．in the drawer        C．on the pencil case

3．_______ in the pencil．

A．A pen is            B．An eraser              C．A and B are

4．The_______ is orange．

A．pen                  B．pencil                    C．pencil case

5．Where is my English book?  

A．Under the sofa    B．On the desk            C．Sorry，I don’t know．