Not until Kentucky’s Mammoth Cave had been completely explored in 1972 _________.

My mother _____ the responsibility for running the household.

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction.

No longer satisfied (A) with the emphasis (B) of the Denishawn school, Martha has (C) moved to the staff of (D) the Eastman school in 1925.

John: ”Do you think that we should use public transportation to protect our environment?” - Laura: “________________.”

Knocking on closed doors before entering can be a great way for children to practice _________ behaviors.

Mark the letter A, B, C or D on your answer sheet to show the underlined part that needs correction.

The (A) shopkeeper warned the boys don't (B) learn their (C) bicycles against (D) his windows.

Mark the letter A, B, C, or D on your answer sheet to indicate the word whose underlined part differs from the other three in pronunciation in each of the following questions.