[ Grammar ]
You should always wear sunscreen in the sun, ___________ between 10:00 and 2:00 when the sun is hottest.
A. first
B. especially
C. however

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Vocabulary › Viewan acronym for the National Aeronautics and Space Administration
A. NASA
B. terrain
C. debris
D. frigid
Phrasal Verb › View
pay part of the price for sth and the rest over a period of time
A. pay down
B. pay for
C. pay off
D. pay back