childhood _____ problems continue to threaten
A. organic
B. obese
C. obesity
D. original
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23000 students from 36 schools in Germany were taught about the benefits of _____ diet.
A. vegan
B. vegetarian
C. vegetable
D. vet
save water的同义词
A. run out of water
B. conserve water
C. conservation
D. make good use of water
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.