FILL IN THE BLANKS WITH THE CORRECT PAST AND PAST PERFECT TENSE OF THE VERBS: 1)__(already/compare) your answers before l ___(eliminate the wrong answer.
2) Meralco (cut) the lines while the fire __(not/burn) yet all the houses.
3) Noah(built) the ark before the rain _(pour) hard.
4) Roger (become) addicted to smoking since - he___(start) many years ago.