Ordinary soap, _________ correctly, can deal with bacteria effectively.
used
to use
using
use
With a lot of things , John will have a difficult time.
A big earthquake hit Ludian in Yunnan, ________ many deaths and injuries and a big loss of property.
______ along with host families, I believe, language travel students are likely to get enough language practice.
Today we have chat rooms, text messages and email, but we seem _______ the art of communicating face-to-face.
_________ to too much sunlight will do harm to your skin.