We had meetings for hours to design a new product.

I plan to spend this year's Christmas with my family.

I have been in a long-term association with him.

Dating with compensation is prohibited by law.

The problem of finding the least common multiple is one of the basic problems in mathematics.

They learned about the least common multiple in math class.

The Great Eastern Japan Earthquake is one of the most damaging earthquakes in Japanese history.

He is suspected of being a member of Al-Qaeda.

It was difficult to tell her family that she was pregnant.

It was difficult to tell the family that she had become pregnant.