Here are the best options for each underlined section based on conventional English standards:
Question 1:
Correct Answer:
There are other schools that do not require auditions but require that you get high grades.
(This option eliminates the unnecessary comma before "but" since the clauses being connected are not independent.)
Question 2:
Correct Answer:
if they have good grades and they do well on tests.
(This option maintains clarity by ensuring both parts of the condition are clearly stated.)
Question 3:
Correct Answer:
based on an application process, and the application process
(This option uses a comma before "and" to correctly connect the two independent clauses.)
So the answers are:
- Second option for Question 1
- Third option for Question 2
- Third option for Question 3