选择am, is , are 填空。
He _______ going to visit America.
We _________ playing chess.
Daming and I ________ flying kites.
The monkey________ climbing a tree.
I ______ riding a horse.
There ________ a cat in the tree.
There ________ four sheep on the hill.
There ________ some rice and vegetables in the box.
________ there a panda in the park?
Sam _______ going to take pictures in the zoo.
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