They ______ his shorts. （   ）

A．are

B．is

C．am

Here______________ your desk. (  )

A．is

B．am

C．are

— Are they giraffes? （   ）
—Yes, they ______.

A．am

B．is

C．are

Fill in the blanks with proper words (用所给单词的适当形式填空)
1.Here _______ (be) some dog food.
___________ (not run) in the classroom. 
3.--- Are the lion’s ________ (tooth) sharp?     --- Yes.
4.My brother is six. He _______ (have) many toys.
5.---__________ (there be) any students in the Century Park? --- Yes.
6.The crow is very __________(full), he wants to eat much food.
7.Here’s a photo of ________ (I ) birthday party.
8.In Shanghai, summer is _________ (sun), hot and wet.

This ______ my duck. （   ）

A．am

B．is

C．are