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________ has been mentioned above，continued chairman after he took a sip of coffee，________ the project must be carried out before spring flood comes.

China's success in manned－spacecraft travel shows ________ our country has become one of the greatest powers in space research.

________ you have seen both fighters，________ will win?

It was a matter of ________ would take the position.

It is pretty well understood ________ controls the flow of carbon dioxide in and out the atmosphere today.

(2013·重慶，27)It was with the help of the local guide ________ the mountain climber was rescued.

(2013·新課標(biāo)Ⅱ，10)It was only after he had read the papers________Mr.Gross realized the task before him was extremely difficult to complete.

(2013·天津，11)It was not until near the end of the letter________she mentioned her own plan.

I don't mind her criticizing me，but ________ is how she does it that I object to.

(2013·安徽，21)From space, the earth looks blue.This is ________about seventy­one percent of its surface is covered by water.