用be的正确形式填空。 1. There _________ a piano against the wall. 2. There _________ some flowers on the desk. 3. There _________ some tea in the cup. 4. There _________ two tins of coke in the bag. 5. There _________ three buildings and a beautiful garden in our school. 6. There _________ some meat, some bread and some apples on the table. 7. There _________ a picture and a clock on the wall. 8. There _________ a volleyball match in our school the day after tomorrow. 9. There _________ no factories, hospitals and schools here fifty years ago. 10. There may ________ something wrong with your watch. 11. There ________ any mail for you today. 12. There ________ any letters in the mailbox today. 13. How many kinds of animals ________ there in this area?