Find proverbs on the vocabulary section that you could use in these situations.

1. Someone says they have just been offered a free two-week holiday, but are hesitating whether to take up the offer. Never look a gift-horse in the mouth.
2. Someone thanks you and your friends for helping to load heavy boxes into a van.
3. Someone says they can't be bothered applying to different universities and will just apply to one.
4. Three different people have made different arrangements for the same meeting, and so everyone comes at different times and the result is total confusion.
5. Someone is worried about a journey you are making with them and keeps saying things like 'What'll happen if the plane is delayed?', 'What'll we do if our luggage gets lost?'