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阅读下面短文,在空白处填入1个适当的单词或括号内单词的正确形式。

With hospitals filled up with COVID-19 patients, NASA has announced it will be delaying an upcoming satellite launch. The liquid oxygen  (need) to fuel the flight is also needed in hospitals,  doctors use the important resource to keep (dangerous) sick COVID-19 patients alive.

"Medical oxygen is priority(优先)of our members, " says Richard Craig, vice president of technical and regulatory affairs for the Compressed Gas Association.

A shortage of truck drivers  the certifications needed to transport the oxvgen is only adding to the problem, and there are (concern) about other rocket launches being pushed back as well.

At the recently held Space Symposium in Colorado, SpaceX president Gwynne Shotwell  (invite) anyone with access to liquid oxygen to reach out. "We certainly are going to make sure the hospitals are going to have the oxygen that they need but for anybody who has liquid oxygen  (spare), send me an email, " she said.

SpaceX founder Elon Musk tweeted that the shortage was "a risk, not yet a limiting factor". So far, 26 rocket launches  (plan) by the company.

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