Mark the letter A, B, C or D to indicate that underlined part that needs correction in each of the following sentences

V.Mark the letter A, B, C or D to indicate that underlined part that needs correction in each of the following sentences.                                                                                                                                                                    

11.The doctor suggested that she does exercises regularly and go to bed as early as possible.

12.I wish I can set foot on every corner of Vietnam when I reach40.

13.They are getting used to eating alone as their parents often come home lately.                                             

14.It is expected that there has been more than 5 million international tourists to visit Ha Long Bay this year.

15.I used to having a very bad argument with my Maths teacher when I was at high school.