—Do you know where the headmaster is? I have something urgent. —Oh, he ____ have gone far, for the computer is still on in the office.
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.
In my opinion, what you told us just now doesn't make any __________.