The ground is wet, ________ it mined yesterday.

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Can such a thing ________ happening again?

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The two rings are so ________ alike that it is difficult to tell one________ the other.

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She is ________ thoughtless ________ stupid．

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He pushed the door open ________.

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The distance ________ in one second is 186,000 miles or 300,000 kilometres.

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从A、B、C、D四个选项中，选出可以填到空白处的最佳选项.

All substances (物质), ________ solids, liquids, or gases, are entirely made up of atoms.

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----Is Mary coming to the concert?

----I think_______.

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He doesn't know ________ to leave or not.

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The guide told us that he would organize some businessmen abroad ________ next week.

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