根据首字母及汉语提示完成单词拼写，使句意通顺：

1. Sunday is the f________ (第一) day of a week.

2. Mike ________ (骑) his bike to school every morning.

3. Thank you for your i________ (邀请).

4. We have different h________(习惯).

5. Can you help me to c________ (选择) some CDs?