选择正确的单词填空把句子补充完整。

1. He's wearing a blue coat _____________ (in / on) a Wednesday morning.

2. _____________ (What / Whose) day is it?

3. Today is _____________ (Tuesday / tuesday).

4. I _____________ (is / am) wearing a white sweater today.

简述委托开发合同中委托人和研究开发方的义务。