dumbfounded

"The mayor's office held a special ceremony to honor the city's firefighters. "

"Turn the doorknob to open the door."

"When he walked into his surprise birthday party, he was completely speechless."

"The complicated instructions on the new software program confused me. "

"John and I have been friends ever since we were roommates at college.   Trust is important between friends.   I used to find it hard to make friends when I was shy."

"The disaster shocked the world."

"Everyone in the class needs to bring their textbook to the first lecture. "

"The party left behind a mountain of empty pizza boxes. "

"After many years of hard work, Maria received a promotion to senior manager. "

"It was a surprise to find out I owed twice as much as I thought I did."

"The contract requires that the party of the first part pay the fee."

"All the different possible options may bewilder us."