Read the following passage and mark the letter A, B, C, or D on your answer sheet to indicate the correct word or phrase that best fits each of the numbered blanks.   

  The USA is encouraging Americans to wear face masks.There has been a lot of talk about whether or not face masks are effective in helping slow down the (25)______ of the COVID -19 coronavirus.The government is set to encourage Americans to use homemade face covering like cloth masks, bandanas and scarves.At first, the WHO and some health organizations recommended that people (26)______ were not sick didn’t need to wear masks or cover their faces.(27)______, it is now proved that face masks can work effectively.They point to countries like Singapore and South Korea, where people wear masks and reported infection (28)______ are lower.     There has been a lot of talk about whether or not face masks are effective in helping slow down the (25)______ of the COVID -19 coronavirus.

There has been a lot of talk about whether or not face masks are effective in helping slow down the (25)______ of the COVID -19 coronavirus.