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

 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

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Paul doesn't have to be made ___. He always works hard.

#97795

learn

to learn

learned

learning

  In freezing weather, snow can turn into ice, which is easy to ________.

#88284

be slipped

slip

slip on

be slipping

 Now I regret ______ those weight-loss pills.

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took

taking

taken

to take

---What made you so angry?

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Mary’s leaving, instead of

Mary’s left, instead of

Mary’s leaving, without

Mary”s leaving, instead

The highway　　 to the city is under repair now.

#98007

leads

led

to lead

leading

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