There is no need for you to look up every new word you ________ while reading.
You didn’t take his advice. ________ his advice, you ________such a stupid mistake.
The radiation amount of a mobile phone for two half-hour periods per day is equal to ________ to an X-ray for ten seconds.
. ________ he realized it was too late to return home.
It’s already 10:00, I wonder how it _______ that she was two hours late on such a short trip.
One of the greatest benefits of Internet friendships is that they are based on common interests, ________ appearance, age or popularity.