根据语境或句意，从所给词的适当形式填空。

1. "I'd like to help _______ with their schoolwork. "

    "You could volunteer in an after-school study program." (kid)

2. Teresa likes crispy cookies. They are hard, dry and _______ broken. (easy)

3. Martin was _______ in Chinese history after he came to China and he read a lot about it. (interest)

4. Spending time with our family and friends _______ very important to us Chinese. (be)

5. Our teachers encourage us to join the volunteer project to help _______. (other)