* Mark the letter A, B, C, or D on your answer sheet to show the underlined part that needs correction in each of the following questions.

The skin of mammals is a complexity organ that serves vital protective and metabolic functions.

* Mark the letter A, B, C, or D on you answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.

The A.I. expert wanted to have his assistant _______ the newly made robot.

* Mark the letter A, B, C, or D on you answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.

Emma and Karen used to be ______ good friends that I’m surprised they don’t get on now.

* Mark the letter A, B, C, or D on you answer sheet to indicate the word that differs from the rest in the position of the main stress in each of the following questions.

We are all very sorry that we have to wait for this agreement to come into_________.

* Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

He was so addicted to social networks that he quitted all other outdoor activities.

* Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

“Do you fancy a drink?” –“___________”

* Mark the letter A, B, C, or D on your answer sheet to indicate the most suitable response to complete each of the following exchanges.

Immediately after his arrival home a water-heater exploded.

Before the cotton gin A. had been invented in 1794, American famers B. had cheap C. salves remove seeds D. from the cotton fiber.