根据括号中的要求改写下列句子。

1. Betty and Tony buy a baseball cap for Lingling?(对画线部分提问) 

    ______ ______ do Betty and Tony buy for Lingling?

2. You mustn't do any reading in the sun.(改为同义句)

    ______ ______ any reading in the sun.

3. Our home rules are different. (用the same改为选择疑问句)

    ______ your home rules ______ different the same?

4. Chinese usually wrap hongbao in the red paper because it's lucky.(对画线部分提问)

    ______do Chinese usually ______hongbao in the red paper?

5. What is it?The class guesses.(将两个句子合成一句)

    The class guesses what______ ______.

其他合同形式是指除了口头合同与书面合同以外的其他形式的合同，主要是（）。

A.确认书形式

B.默示形式

C.批准形式

D.登记注册形式