(  )15．The tree must be put straight in the hole．

Ⅳ．听下面一段对话，根据所听内容选择正确答案。(每小题2分，共10分)

(  )14．The ground must not be too hard．

(  )13．The hole should he enough big and deep．

(  )12．The earth should be very wet．

(  )11．Summer is the best time for planting trees．

III．听录音，判断正(T)误(F)。(每小题1分，共5分)

10．(  　)

9．(  　)