My grandfather used to till his privately-owned rice field.

He holds a personal grudge against me.

Using the private railway makes commuting very convenient.

I achieved a big success.

He graduated from the University of Tokyo.

His dream is greatly expanding.

Under the big tree, he was reading a book.

The greater part of the time is spent on work.

Linear programming is a part of operations research and is used to find the optimal solution.

Paying the urban planning tax is a citizen's duty.