根据句意填词.
1. Today is Sunday and _______ was Saturday.
2. He enjoys _______ the guitar.
3. My friends want to have a _______ party for me.
4. Today is _______ 1st. It's National Day.
5. —What _______ is it?
—It's black.
1. yesterday 2. playing 3. birthday 4. October 5. color