问题详情：
用方框中所给单词的适当形式填空，使句子通顺、正确。每词仅用一次。
able speech necessary twelve worry |
1. It is to have a good diet to stay healthy.
2. I went to that game with my mom and Tom on my ________ birthday.
3. With an empty head, I am ________ to do my homework! Who can help me?
4. Your son is thirteen and he can look after himself . You needn’t be ________ about him.
5. Thanksgiving is celebrated with a meal among family and friends. They make short __________ and give thanks for their food.
【回答】
1. necessary 2. twelfth 3. unable 4. worried 5. speeches
知识点：选词填空
题型：完成句子
