—Is that Dec.21,2012 is the end of the world true?—Definitely not, but ______ must be paid to global climate change.
Keep _______ when I take your photograph.
—HowmuchdoIoweyouforlunch? —________________.It’snothing.
It ________ that their plan was practical and successful.
It is considered a good way for students to ________study with pleasure.
It is known to all that a proper amount of exercise ________ to good health.