根据课文内容填空(每空不限词数；共6个空格，每空格1分，满分6分)
NCE 47
We keep trying all four methods, but the 【小题1】 we produce worldwide 【小题2】 .
NCE 48
We expected the path 【小题3】 , but we found that it 【小题4】 through the trees.
NCE 49
…, but Bessie seemed unable 【小题5】 . She 【小题6】 and kept mumbling about the guests.sheer volume of rubbish
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(答案→)sheer volume of rubbish
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