1. More than 1 million people in southern California and northern Mexico were without electricity after _______ major power failure struck just before _______ afternoon rush hour.
A. a; an B. a; the C. the; the D. the; an
2. If not _______, you’re allowed to return everything within 10 days for a full refund and no further duties.
A. to satisfy B. being satisfied C. satisfied D. satisfying
3 —Have you finished the book?
—NO. I've read up to _______ the children discover the secret cave.
A. where B. what C. that D. which
