EXERCISE 1: elmentary (choose) BEFORE, AFTER, UNTIL, AT, ON, IN, THEN
EXERCISE 2: WRITE until when just as before as soon as during while for
EXERCISE 3: WRITE at, next, in, last, during, when, every, ago, on
EXERCISE 1: elmentary (choose) BEFORE, AFTER, UNTIL, AT, ON, IN, THEN
EXERCISE 2: WRITE until when just as before as soon as during while for
EXERCISE 3: WRITE at, next, in, last, during, when, every, ago, on
