He succeeded in unlocking the door.

He succeeded in unlocking the door.

I needed to calculate the factorial of 5 for a math problem.

He was enjoying fishing on the sea.

I received a circular from my friend yesterday.

We held a meeting at the meeting place.

He opened a new restaurant for business.

The opening of the concert is at 6 p.m.

The denuclearization of North Korea is an important issue for world peace.

He compared his grades with his friend's grades.