tìm lỗi sai và sửa lại
26. /Christmas/ (A) tree/ is usually decorated/ (B) /by/ (C) /colored lights and shiny balls/ (D).
27. /Chris said that /(A) the twins /couldn’t go/ (B) to school /this day/ (C) because/ they were ill /(D).
28. If you/are/ (A) /interested on /(B) helping, /just show up /(C) /on Saturday/ (D).
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