读句子,从方框内选择恰当的词或词组填空。 There are; There is; have; Are there; Is there; has 1. They ___________ six cats. 2. ___________ any toy animals in the table? 3. Our classroom ___________ two doors. 4. ___________ seven days in a week. 5. ___________ an apple on the desk. 6. ___________ a lake in the nature park?