Graph theory is a branch of mathematics that studies mathematical structures called graphs.

I am going to Cairo, the capital of Egypt, next week.

I wake up at six o'clock every day.

He was surrounded by enemies, but somehow he opened an escape path and ran away.

I walk on the wide road to go to school.

He is working on wood and metal using a lathe.

The lawn of my house is very wide.

I took out a loan to buy a new car.

I can't log in to my account.

I log into my computer every morning before I start work.