—How unhappy your roommate looks!—Yes, but he's not willing to tell me what it is _______ is troubling him.
Nearly all educators believe that a challenging situation can often __________ the best qualities of a person.
We __________ that the two substances have combined to form the new material.
The people of the town were __________ of the danger of flooding.
All finished, they sat down to enjoy __________ they thought the most delicious dinner.
Nowadays people attach more importance __________ the children's preschool education than before.