[ Grammar ]
What is the subject of a sentence?
A. The action in the sentence
B. The person or thing performing the action
C. The location of the action
D. The time when the action occurs

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Vocabulary › Viewone of a kind
A. unique
B. traits
C. variations
D. species
Grammar › View
Giraffes, the tallest animals in the world, measure more or less as same height as a one-story building. Which one is incorrect word/phrase?
A. the tallest
B. in
C. as same
D. one-story
She always (buy) groceries.
A. buys
B. buies
C. does buy
Tenses › View
He ____ several social activities recently.
A. has joined
B. joined
C. had joined
D. was joining