Why was she so seriously _________  about her family in this matter? (concern)

While _________ in the street,  he happened to meet one of his friends, (walk)

Would you like to join us _________the game?

The two leaders at last met face _________ face.

I think he did it_________ purpose.

The operator finally got him_________.

There is no reason _________being late.

They had hidden _________ for three days before the enemy left.

The music added_________ our enjoyment.

Our basketball team won the game _________ 5points.