A根据句意或汉语提示写出单词。（共10小题，每空1分，计10分）
1．The whole class is____________ (分成)into four groups．
2. It’s _____________ (fair) to blame him. He did nothing wrong.
3. I am always ____________(worry) about my parents’ health.
4.They are so ___________ ( imagine) that they can make a new model plane.
5.Sandy organized a charity show ________________ (success) last year.
6.Bill was feeling sad. He told me about his ____________________(happy)