C．deliver D．rewrite

　　B　[根据最后一段中的The messages people receive can be kept with them forever可知，当人们在树枝上挂上一张信息卡的同时，也要取下一张自己"保留(keep)"。]

　　8．A.amazing B．strange

　　C．direct D．painful

　　A　[根据下一句中的People of all ages...sharing art and inspiration可知，这种经历是"令人惊喜的(amazing)"。 ]

　　9．A.room B．tree

　　C．card D．pen

　　B　[根据上文中的create a piece of art...message to hang from the branches及The tree changed into this really funny way...positive messages可知，人们通过这棵"树( tree)"来分享艺术和鼓励。]

　　10．A.raised B．earned

　　C．received D．borrowed

　　C　[ 根据第一段第一句话I was very fortunate to be chosen by Kindspring to receive $100 for the monthly kindness competition可知，作者从Kindspring"获得了(received)"100美元。 ]

　　11．A.school B．hospital

　　C．park D．library

　　A　[根据空后的a student teaching in a 6th grade special education classroom可知，作者把一棵励志树带到了一所"学校( school)"里。]

　　12．A.planting B．decorating

　　C．adjusting D．using

　　D　

13．A.record B．practice