IF YOU DON'T KNOW WHAT A WORD MEANS, LOOK IT IN THE DICTIONARY.A. O...

9. - KIEM TRA 15 PH (SAU UNIT 15)
KIEM TRA 15 PH (SAU UNIT 15)
9. If you don't know what a word means, look it in the dictionary.A. over B. up C. on D. at