Of the seven days in a week, Saturday is said to be the most popular ___ for a wedding in some countries. 

I prefer to eat in that restaurant, because the ____ of service there has improved a lot.

Hiking by oneself can be fun and good for health. It may also be good for      building.

He spent a large ___ of money on his books.

Angela and John picked up the marriage ____ after they met online several times, which was not sensible．