Your mother becomes more and more forgetful. —Yes. She searched for her cellphone for a whole day last Sunday but it ___ in her coat pocket the next day.

We’ll learn much from this failure, so our suffering and efforts are not ________.

The story of Li Tihas drawn the attention of ________ public.

He must be a true friend, isn’t he—Of course he is. He seldom _______ a bad word about others.

He has behaved in the most extraordinary way；I can’t________his behavior at all.