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28. 掌握以下常見標志： ENTRANCE EXIT PUSH PULL NO SMOKING NO PARKING FRAGILE THIS SIDE UP NO PHOTOS DANGER BUSINESS HOURS PLAY STOP PAUSE ON OFF

IV. 重要語法

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27. --- The hole should not be too deep.

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26. --- The (ground ) must be just right…

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25. --- More or less!

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24. --- The more, the better.

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23. --- The Great Green Wall is 7000 kilometres long, and between 400 and 1700 kilometres wide.

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22. --- The hole should not be too deep.

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21. --- It's best to …

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20. --- The (ground ) must be just right…

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19. --- Where is / are … grown / produced / made ?

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