If we keep wasting so much energy, ________ are that our oil wells will dry up and the environment will be destroyed.
______ 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.
----The light in the office is still on. ----Oh, I forget ______.