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阅读下面材料，在空白处填入适当的内容（不多于3个单词）或括号内单词的正确形式。
Once upon a time, a boy was walking through a large woods (61) __________ he found a big blackboard hanging on an old tree trunk. It came complete with a box of chalk pieces, and bright sparks were flying from the tips of every piece of chalk. The boy took a piece of chalk and started to draw on the blackboard: first a tree, then a rabbit, and then a flower …
(62)_________（magical）, whenever he finished a figure, it came to life and jumped out of the blackboard. Before long, the place became a wonderfully green and fertile forest, full of animals playing happily.
(63)__________ (excite), the boy also drew his parents and brothers and sisters enjoying a picnic, with their sandwiches and cold meats. He also drew the paper plates and the empty tins of sardines（沙丁鱼） left on the ground, (64) __________ always happened on their picnics. But when these bits of litter came to life, (65)__________ awful happened: around every paper plate and every empty tin, the forest turned grey, and this greyness started spreading quickly everywhere: to the grass, to the flowers, to the animals … The boy realized the litter was (66) __________ (blame) for all the greyness, so he ran through the forest with the blackboard rubber in his hand to rub it out wherever it (67) __________ (land).
He was quick and lucky, and didn’t leave a single piece of litter. The forest and its animals managed to recover, and they played together for the rest of the day.
The boy never again saw that blackboard, but now, every time he goes to the countryside with his family, he (68) __________ remember that adventure and is the first (69) __________ (pick) up any litter. And he is sure to remind the others that anything (70) __________ (leave) in the woods can do more damage to the environment than they ever would have expected.
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