根据首字母和汉语提示完成单词。

1. In the USA, when you get a present,you must open it i______.

2. In China, when someone gives you a present,you must  w______ and open it later.

3. When you ______(接受) a present,you must use both hands.

4. You mustn't do any   c______ on the first day of the Chinese New Year.

5. In China, people eat lots of  d______  at Spring Festival.

影响软件开发成本估算的因素不包括以下哪项 (4) 。

A) 软件人员业务水平
B) 软件开发规模及复杂度
C) 开发所需时间
D) 开发所需硬件资源模型。