用所给单词的适当形式填空。 1. The children were _____
题型：填空题
问题：
用所给单词的适当形式填空。
1. The children were ________ because they didn't get Christmas presents. (happy)
2. How can you make yourself ________ if you cannot express yourself clearly? (understand)
3. December is the _______ month of the year. (twelve)
4. The doctor's ________ made all of them sad. (dead)
5. I think this dictionary is ________ for your study. (help)