Choose the correct options to complete the sentences

1. [If|When| If/When] Sarah is late tonight, we will not wait for her.
2. Bobby, [when|if|if/when] you are not attentive, you make so many mistakes!
3. [If|When| If/When] you don't want to cook dinner, we can order takeaway.
4. Will we have a barbecue tomorrow [when|if|if/when] there is no rain?
5. Will we have a barbecue [when|if|if/when] Tommy feels better?
6. We can cook pizza together on Sunday [when|if|if/when] I have some free time.
7. [If|When| If/When] most people understand the consequences of the greenhouse effect, it might be too late.
8. [If|When| If/When] my dad finishes work earlier tonight, we'll play a game of soccer.
9. [If|When| If/When] I finish reading, we can go for a walk.