V. Combine each pair of sentences, using the linking word given in brackets.
21. Tom was thirsty. He refused the glass of water I brought him. (although)
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22. Our classroom is hot and crowded. I don’t like our classroom. (because)
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23. Ann’s father gave her some good advice. She didn’t follow it. (however)
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24. The windows were all left open. The room was a real mess after the windstorm. (therefore)
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25. I was unprepared for the exam. I felt sure I would get a low score. (because)
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