CLEAN AIR PROVIDES US __________ OF OXYGEN.A. OF A WEALTHY SUPPLY...

25. - DE THI DAI HOC TIENG ANH
DE THI DAI HOC TIENG ANH
25. Clean air provides us __________ of oxygen.a. of a wealthy supply b. with a healthy supplyc. at a healthy provision d. on a healthful stockIdentify the words / phrases that need correcting to make perfect sentences.