根据句意及首字母提示补全单词

1. W_____ is your mother’s birthday.

2. Christmas(圣诞节) is in D______.

3. September t_____ is Teachers’ Day.

4. My b______ is October 21st.

5. Dave had a birthday p_____ yesterday.

建筑工程一切险保险人的保险责任自保险工程在（）或用于保险工程的材料.设备运抵工地之时起始。

A.工人进场

B.工地动工

C.招标结束

D.购买保险