is a problem in all places around the world —in developing and developed countries． （食品安全）
Whales are because some people make their ocean home dirty and others kill them for meat． （处于危险之中）
We will have a party in the classroom ． （后天）
Nowadays， many foreigners learning Chinese． （对……感兴趣）
are those who make you smile， always open their hearts to you and encourage you to succeed． （friend）