Choose the underlined part that needs correction

Exercise 8: Choose the underlined part that needs correction

1. Christmas (A) tree is usually decorated (B) by (C) colored lights and shiny balls (D).

2. If you are (A) interested on (B) helping, just show up (C) on Saturday (D)

3. Many Vietnamese (A) people prepare for (B) the holiday by pay (C) their debts and cleaning (D) their homes