It is (有礼貌的) to knock at the door before entering a room.
We depend on nature to live, so it is necessary for us to protect it (明智地,充满智慧地).
Don't tell the secret to a third person. Just keep it to (我们自己).
Trust me, please.
Giraffes are quite tall. Their long necks help them eat the (树叶)from trees.
Kitty (邮寄) a special present to her father last Father's Day.
如果在这里建设一个新的机场,许多动物将失去家园.