He made a presentation at an international conference, making excellent use of his English.

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

He was enjoying fishing on the sea.

We held a meeting at the meeting place.

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

He opened a new restaurant for business.

I have been to Kaesong in North Korea.

He succeeded in unlocking the door.

He succeeded in unlocking the door.

I received a circular from my friend yesterday.