The boy said ___ couldn't he work out the problem but his teacher didn't know how to do it.
Readers can ______quite well without knowing the exact meaning of each word.
______ it is to have a picnic in the hills on such a nice day!
You must apologize ______ her ______ what you have done.
The bad weather discouraged us ______ on the picnic and we had to stay at home.
A good student is honest and kind to others. In other words, he never ______ his friends.