[ Vocabulary ]
It’s usually difficult to learn a ________ language.
A. foreign
B. native
C. abroad
D. mother

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If her friend hadn’t moved away, Maria ____ sad.
A. would be
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By the time the project was launched, the team _____ extensive research.
A. conducts
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A. adds
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The children …learned English
A. Have
B. Has
C. Is
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