67. Yesterday was my _______ (15岁) birthday .

66. I have a toothache. I have to see a __________(牙医).

65. This box is h_______ than that one.　　

64. Eat a balanced diet to s_______ healthy.

63. Deng Yaping is an outstanding ping-pong player, and she got many m　　　 in her sports life.

62. The boy got lost in the forest for a month. When people found him, he was still a　　　 .

61. Li Yundi is talented on music. He is a f_______ Chinese pianist.

　Not many people have seen icebergs. Sailors(船员) sometimes see them but they 　51　 　to keep away from them. We call the top and bottom of the world the South and North Poles(南北极). Here there is ice over the sea and the 　52　 . The ice is often thousands of meters thick. The ice often moves slowly down 　53　 　the sea. Then big pieces of ice break off and float(漂浮) on the sea. We　 　54　 　these big pieces of ice “icebergs ”.

　Most of an iceberg is under the water. Ice is only a little 　55　 　than water. The top of an iceberg may not be near 　56　 　a ship, 　57　 　the ship hits the iceberg below the water.Then the ship　 58 　.Sometimes the water becomes　 　59　 . The bottom of the iceberg becomes smaller and smaller. Then it turns right over. Sometimes it hits a ship. Icebergs are often very beautiful but they are also 　60　 .