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
小题1:Mary accepted the      suggestion. She decided to remove the bad tooth later.
小题2:It’s a      experience to do the project with you.
小题3:—How can you speak such perfect English!
—I teach      on the Internet.
小题4:You’re      if you always say bad words about your friends.
小题5:The zookeeper told us to walk      and not to frighten the birds.