14. Day and night, the little boy is at his computer, playing computer games, as if ______ with them.
When traveling abroad, we should ______ learn more about local customs so as to avoid unnecessary misunderstanding during communication.
-- Not knowing what style of iPad to choose, _______.
It seems that living green is ______ easy and cheap. A small step can be rewarded with long-term benefits.
What impressed me in Greece was that the oceans _______ the islands were deep blue and many cities lay on the bay.
Researches show that the taller you are, the more _______ you are to suffer back pain.