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In mathematics, a variable is a symbol ................. some element of a set.

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  When his wife gave birth to a baby boy, Mr. Nam became the sole ____

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  English is compulsory _______ all students, but art and music are optional

• We often go swimming when the weather is_____________.

   

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  The city's mayor is ------- to attend this weekend's charity marathon.

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  He ____ on his essay all day, but he ____ yet.

• Choose the letter A, B, C or D to complete the sentences.  "  ….name is Cherry."

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  ................. problems in sailing in tropical seas is the coral reefs.

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  He was very busy yesterday, otherwise, he______to your birthday party

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  Let me just grab a pen so I can jot that number ___________

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  The emperor demanded that the thief______brought before him

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  They prefer ____ in a swimming pool all day

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  Mr. Aoki resigned ------- his position as communications manager for Western Europe since his health condition had suddenly deteriorated

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  Those with higher levels of education tend to be healthier than those of similar income ____ are less  are less educated

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  The flower gave ___________ its heavy perfume at dusk

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  The city centre was quite a _____ away from my house. It takes me nearly an hour to drive there

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  Kids with dyslexia may have ____ questions about something they've read.

• Choose the letter A, B, C or D to complete the sentence: How old … Nhu?

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  Scientists are looking for an ____ way to reduce energy consumption

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   ___ tall are you?

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  ................. their territories but rather than fight, they howl