根据句意用所给单词的适当形式填空。每空一词。
My father’s job is different from those ______________ (spaceman).
The dentist says we should brush our teeth at least ____________ (two) a day.
Little Sam looked ___________ (hope) at his mother and expected to get more pocket money.
To keep fit, we should eat ___________(little) food and do more exercise.
It is ____________ (possible) for him to finish the hard work within an hour. Let’s help him.