用is或are填空。
1．There ________ a boy on the bike.
2．There ________ three dogs in the room.
3．The panda ________ eating fruit.
4．The pigs ________ eating vegetables.
5．There ________ some girls in this photo.
6．There ________ a sheep in this photo.
7．There ________ two boys in the classroom.
8．There ________ some cats under the tree.
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