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.