填空题
What subject did Fred stay up all night preparing for?
填空题
Most of the research about the link between coffee and heart disease is ______.
填空题
Without caffeine, people will suffer draw ______.
填空题
Studies have shown that coffee makes you work faster but not necessarily ______.
填空题
12 ounces of soda has only half the caffeine of a 5 ounces cup of ______.