John is the tallest boy in the class, _______ according to himself.

I am _____ about what I say because careless remarks are likely to hurt others' feelings．

After the exams , we shall have _______ holiday .

Because of the strong sun Mrs. William’s new dining room curtains _____ from dark blue to gray within a year.

There are many insects in the world that never do _______ harm to human beings.