--How did he get infected? --She ____the viruses without any protection.
—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.
I have read the material several times but it doesn't make any ____ to me.