按要求完成下列各句，每空一词

1．There is a football under the bed．(对划线部分提问)

            under the bed?

2．They’re oranges．(改为单数句子)

                               .

3．Can you see her desk?(作否定回答)

                                 .

4．The boy behind the tree is Jack．(对划线部分提问)

                     is Jack?

5．我喜欢喜剧，因为它们很有趣。(完成句子)

I like         ，because they are              ．