句型转换。 按句子的要求在空白处填上适当的词（共10分）。
（1）It is an orange.(变为复数句)           They                       .
（2）Is there a kite?(作否定回答)   No,                     .
（3）Christmas is in winter.(对划线提问)                     Christmas ?
（4）There are some dates.(变为否定句) There                      dates.
（5）There is a hippo.(改为一般疑问句）                   a hippo?