Rashi questions for Vayelech

According to Rashi...

1. What did Moshe mean when he said that he could not longer go out and come int?  (31:1)
2. How did Moshe's advice to Yehoshua differ from Hashem's advice to Yehoshua?  (31:7)
3. Why did children ceom to the hakhel convention?  (31:11)
4. What song did Moshe write down?  (31:19)
5. What promise does Hashem make to Israel?  (31:21)
6. Where did Moshe place the first Torah ever written?  (31:26)