In text 9A4CCC, how well students are expected to perform (l.14) means how well students 
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"the Japanese" (line 4) refers to a single person from Japan.
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"The dog" (line 1) means a specific type of animal. Not a specific dog.
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not anymore is a correct alternative to no longer (line 1).
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In 1993 the dog population in Britain increased by 7 million.
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all day (line 8) has the same meaning as every day.
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It is clearly stated in the text that there are now more cats than dogs in British homes.
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Both Besides and Furthermore can be used instead of In addition (line 2).
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If we want avoiding is a suitable alternative for If we want to avoid (line 4).
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by 2050 (line 4) means that 2050 is the deadline.