72.　 The only problem is we can’t eat tree.

71.　 Many thousands of trees must be planted every year.

70.　 Trees in the forests can keep raindrops from hitting the soil directly, so the soil is not easily washed away.

69.　 Tie the tree to the top of the stick to keep it straight.

68.　 Put the tree in the hole so that it is straight.

67.　 I say it is special because the dinosaur was covered with feather.

66.　 Dinosaurs lived on the earth for more than 150million years, and then disappeared about 65million years ago.

65.　 This is a digital camera.

64.　 Which language is the most widely used in the world?

63.　 It’s made of bamboo and animal’s hair.