Each of the following sentences has one error (A, B, C or D). Find it and blacken your choice on your answer sheet.
1. A president of the US - Joe Biden, felt that no one was better suited for the position of chief staff advisor at that time.
A. A president
B. felt
C. was
D. suited for
2. My teeth has been aching for days, so my mother suggested that I go to the dentist.
A. My teeth
B. for days
C. go
D. dentist