根据句意，用括号内所给单词的适当形式填空。
The maths problem is so difficult that few of the students can work it out_______ (easy).
Jim is a brave man. He always tells_________ (he) to calm down when he meets trouble.
Very few of people believe what the boy says because he is_________ (honest).
Everyone was very happy because of the famous writer’s _________ (arrive).
In the film, the soldiers were excited when they got their________(wife) letters.