[ Grammar ]
The kids were tired, ______ they were happy.
A. so
B. or
C. but
D. and

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Vocabulary › Viewnumber of years it takes a population to double its size based on its current growth rate
A. doubling time
B. death rate
C. sustainability
D. import
Prepositions › View
…………. first, we did not like each other.
A. On
B. In
C. At
D. By
Grammar › ViewYour mother ______ your phone for one hour.
A. used
B. is using
C. will use
D. has used
Prepositions › View
Her birthday is ……. February.
A. In
B. On
C. At
