1.Thingsareknown________whentheyunitewiththeoxygenoftheair.
A.burningB.toburnC.burnD.beingburned
2.Televisionisanothermajorinstrumentofcommunication,________ustoseeaswellastoheartheperformer.
A.permittedB.permittingC.topermitD.beingpermitted
Howtochoose,translateandwhy?Thanks.