请根据句意从方框中选择合适的单词，并用其适当形式填空，使句子通顺。
gentle  welcome    please   I    dentist
Mary accepted the      suggestion. She decided to remove the bad tooth later.
It’s a      experience to do the project with you.
—How can you speak such perfect English!
—I teach      on the Internet.
You’re      if you always say bad words about your friends.
The zookeeper told us to walk      and not to frighten the birds.