Here are the completed sentences:
1) If we don't hurry, we **will be** (be) late.
2) If I see her, I **will give** (give) her your message.
3) If you're hungry, I **will make** (make) you a sandwich.
4) If he **doesn't come** (not/come) to the party, I will be very upset.
5) If she **goes** (go) to Paris, she'll send me a postcard.
6) If we **aren't** (not/be) busy, we'll come with you.
7) If he does that again, dad **will be** (be) very angry.
8) If he **doesn't finish** (not/finish) his homework, he won't go out.
9) If he **comes** (come), I'll talk to him.
10) If she **hurries** (hurry), she won't be late.
11) If it rains, we **won't go** (not/go) out.
12) If they are late, they **will miss** (miss) the bus.
**Explanation:** This is likely the First Conditional. The structure is: If + Present Simple, will + base form of the verb.