Here are the completed sentences, following the instructions.
A) Zero Conditional Sentences:
- When Stan finishes his homework early, he plays video games.
- If I do not have money, I stay at home.
- When it snows, we do not go outside.
- I always lose when I play chess with Dan.
- Kyle wakes up late if his alarm does not go off.
B) First Conditional Sentences:
- If you buy the puzzle, I will help you do it.
- If Grandma comes for a visit this weekend, we will play cards.
- I will buy a new toy dinosaur if Mum gives me the money for one.
- If they do not get here soon, we'll leave without them.
- Gerard will save us a seat at the theatre if we ask him to.
- If they don't clean this pool, I will not swim here again.
- I will cook some pizza if you are hungry later.
- If Sarah does not do her homework properly this time, Dad will be really annoyed.