3.
1) C
2) A
3) B
4) A
5) A
4.
1) * Are you sure? Ok, then I'll stay at home next week.
* I'll visit you next week, if you are not too busy.
2) * I'm going to watch this movie next week.
* I'm going to fill this form, because I can't waste time anymore.
3) * I'm reading a book tonight.
* I'm surfing the web tonight.