The CDC says that even fully _______ travelers risk getting and spreading COVID-19 ______in Japan
A. variant
B. vaccinate
C. variants
D. vaccinated
It’s easy to forget that the ___ for this have been one of the ____ struggles for/in human history.
Today 7 in 10 people on earth can ______ having _______ in their homes
______ that _____ water thrived