like night and day

My mom and dad are like night and day.

We say things are like 'night and day' when they are very different or opposite. We also use this phrase to describe the difference after we make a change.  Notice the following:

1. The difference between the new washing machine and the old one is like night and day.
   
2. My sister and I are like night and day.
   

resembles

Everybody tells her how young she looks and how she resembles my sister.

To 'resemble' someone or something is to have a similar appearance.  Notice the following:

1. He resembles George Clooney a little.
   
2. That rock kind of resembles an elephant.
   

makes friends

My dad makes friends no matter where he goes.

When we start new friendships we are 'making friends.' Notice the following:

1. Where do you make friends?
   
2. When you move to a new place it takes a while to make friends.
   

complement each other

My parents are completely opposite and they complement each other very well.

If two things or people 'complement each other' they each complete the other or make it more whole.  We say this about two things or people that go together well or have a nice balance. Notice the following:

1. Do you think sweet and salty food complement each other?
   
2. My two jobs really complement each other.  One is active and at the other one I just sit.
   

sense of humor

My dad has a very good sense of humor, and my mom is very gentle.

Your 'sense of humor' is what you find funny or what makes you laugh.  A person with a good sense of humor laughs a lot.  Notice the following:

1. Some people don't like this movie, but it fits my sense of humor.
   
2. I don't understand his sense of humor.