[ Grammar ]
Ruby works in the restaurant. When the guests left, she _____ the floor right away(立刻).
A. sweeps
B. swept
C. sweeping
D. is sweeping

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Conjunctions › ViewIn the sentence ‘I will go to the park unless it rains’, what is ‘unless’?
A. Preposition
B. Adverb
C. Coordinating conjunction
D. Subordinating conjunction
Grammar › View
They ______ (travel) in the USA ______ one month.
A. They have traveled in the USA for one month.
B. They have traveled in the USA since one month.
C. They has travel in the USA for one month.
D. They has travel in the USA since one month.
Minh sings a song ……………..
A. beautiful
B. beautifully
Grammar and Vocabulary › View
Vietnam is ………. multiethnic country with 54 ethnic groups.
A. a
B. an
C. the
