[ Grammar and Vocabulary ]
There is oxygen and nitrogen in the air.
A. science
B. technology
C. geography
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Mixed General Quiz › ViewKate can speak three foreign languages.
a. She must be tired.
b. She must be a talented girl.
c. She surely knows the ropes.
Grammar › View
They _____ finished their homework already.
A. has
B. have
C. had
D. having