―I’m too tired. I want to give up.― If you don’t ________, you’ll win in the end.
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.