Mary is proud a record by running two laps this year.
I stopped the car __________ a short break as I was feeling tired.
Volunteering gives you a chance __________ lives, including your own.
I cannot __________ puzzled, for I simply cannot understand how I could have made such a stupid mistake.
-I hear Mr. Black is ill in hospital again.-What a poor man ! I can't help but __________ sorry for him.
If he takes on this work, he will have no choice but __________ an even greater challenge.