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一片药就能在10分钟内净化一升水。

One tablet will ________ a litre of water in 10 minutes．

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I don’t want to ________(冒失去朋友的危险)．

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He saved her ________(冒着生命危险)．

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on/at/to

(1)You’d be crazy to risk your money ________ an investment like that!

(2)People with fair skins are more ________ risk of skin cancer．

(3)Polluted water supplies are a risk ________ public health．

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to/up/out

(1)The competition is open ________ men and women of all ages．

(2)For the first time, Buckingham Palace has been made open ________ the public．

(3)They saw the new railroad as a means of opening ________ the far west of the country．

(4)As she got to know us better, Lizzie gradually started to open ________．

(5)Our business has been opening ________ recently．

The war in Iraq has now become the ________ of worldwide media attention．

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focus/attention/mind

(1)Keep in ________ what the headmaster said at the meeting．

(2)Pay more ________ to your handwriting of your composition．

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我在给你照相时不要乱动。

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请替我留个座位。

Please ________while I photograph you．

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对不起，让你等了。

Sorry to ________．