30. Although I admire you_____your work on soil, I think you should apologize_______the villagers for being the water pollution.
| A．for, to | B．to , for | C．for , for | D．to, to |
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With new technology, pictures of underwater valleys can be taken color.
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The employment rate has continued to rise in big cities thanks to the efforts of the local govenments to increase.
| A．then | B．those | C．it | D．that |
Sit down, Emma. You will only make yourself more tired, on
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| A．to keep | B．keeping | C．having kept | D．to have kept |
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