1.What is wrong with your friend?
1.What is wrong with your friend?
It's nothing s_ He will be ok after a good rest
2.Don't l_ at other people when they are in trouble
3.I think it n_ for us to learn English well
4._(not look) out of the window
5.I am very busy tonight I can't go to your party
(合并为一个简单句)
I am _ busy _ go to your party