1 . Hannah is one of many examples of young people who are making a d________ in the world. (根据首字母单词拼写)

2 . I feel very h________ to have been able to take on this role. (根据首字母单词拼写)

3 . The Internet helps me to keep in c________ with my friends. (根据首字母单词拼写)

4 . During the Mid-Autumn Festival, families gather to a________the moon and enjoy delicious mooncakes. (根据首字母单词拼写)

5 . Half of my classmates are ___________(志愿者) of different community service projects.

6 . The expert delivered a wonderful speech, saying that humans should give animals freedom and that caged animals should be r____________ into the wild.