根据句意，用适当的词填空。
1.There are ________ days in a week.
2.My favorite ________ is hamburgers.
3.________ is the third day of the week.
4.I don’t like science ________ it is too difficult.
5.Maria likes to ________ a little longer on Sunday morning.
6.Mary likes art ________ she doesn’t like music.
