After the Shenzhou-9 manned spacecraft was successfully launched, Liu Yang became the first woman astronaut _______

After the Shenzhou-9 manned spacecraft was successfully launched, Liu Yang became the first woman astronaut ________space in China.

#93302

to enter

enter

entering

entered

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— What made your skin look so terrible? — _______ to the sunlight for a long time.

#95390

Because it was exposed

After being exposed

Being exposed

Exposed

 Carbon dioxide(CO2)_______ from burning fuels is the most common of the so-called greenhouse gases.

#91467

producing

having been produced

to be produced

produced

----    What do you think of the book ? ----    Oh excellent. It’s worth _________ a second time.

#89593

to read

to be read

reading

being read

As a student, every minute should be made use of _______.

#90806

study

to study

studying

studied

  __  carefully if any change occurs when doing experiments in the lab..

#88398

Observe

To observe

Observed

Observing

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