21. It’s three years since I started using this bicycle.  I have __________________________________________________________________ 22. No one has ever answered the questions.  These questions __________________________________________________________ 23. I’ve arranged to meet Mr.Trung tomorrow evening.  I’m ____________________________________________________________________ 24. “You’d better go to see the doctor immediately.”  She advised _____________________________________________________________ 25. They want to buy a bigger house but they don’t have enough money.  If they _________________________________________________________________

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