用所给单词的适当形式完成句子.
1. My father spent two hours _ (cover) the vegetables last night.
2. To our surprise, the little boy can write all the words _ (correct).
3. I think this dictionary is very _ (help) to you if you want to learn English.
4. Look! Your house _ (burn). Let's go and put it out quickly.
5. I feel very _ (pain) all over my head. What's wrong with me?