Mark the letter A , B , C or D to indicate the most suitable response to complete each of the following exchanges . 17 . Mr . Harry : “ You ' ve written a much better essay this time , John ” John A.Oh , you ' re right B.Thank you . Its encouraging C.Never mind D.Writing ? Why ? 18 . Nga : “ You look so nervous . ________?” Trinh : “ This thunder scares me to death . ” A. What ' s wrong B . What ' s that C . Whys that D . What are you