Almost every teenager will experience a period in their life _____ they aren’t content with their parents．

A．when B．where C．that D．which

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The patient in hospital is ready to accept ____ help she can get.

A. wherever B. whatever C. however D. whenever

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While astronauts in space get to do many exciting things, they miss out on ordinary things that we all take for granted—being able to walk on firm ground, hanging out with family and digging into a slice of hot steaming pizza. Though not much can be done about the first two things, there may soon be a solution to the third one, thanks to this cool 3-D pizza printer!

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B. To show they live a difficult life there.

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C. he has no way to make pizza that can last for thirty years

D. he cannot make the food container last for decades

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A. NASA is trying its best to help astronauts eat better

B. Astronauts may soon be able to enjoy steaming hot pizza

C. NASA is working on making pizza for common people

D. A 3-D pizza printer has been used to make pizza

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