Spanish idiom that you would use in each of the following situations:

1. your new neighbor looks mean but after talking to him for a short time, you realize he is actually very nice.

2. after a long illness, your boss is happy to be back at work.

3. you come running into a work meeting fifteen minutes late.

4. your boyfriend (or girlfriend) moves to a new town three hours away. you're sure that things will still work out.

5. you're visiting mexico and you decide to greet a new friend with a kiss on the cheek, which is a local custom.