Answer:
Excel.
Explanation:
For 'excels' to be grammatically correct, it would have to be a sentence like "He excels quicker than all the other students in his class."
Answer:
if we don, t have any competitor in our life we ld loat our life
The indefinite pronoun in that sentence is "somebody"
Answer:
The proper way to say that is:
"The book, which is about a murder on the Nile, was written by Agatha Christie."
Explanation:
you added an extra "which" in there and it was unnecessary