Question 19: You will get a good seat if you __________ first.
(A) come
(B) came
(C) have come
(D) will come

The correct answer is:
A. come
This sentence uses the first conditional structure, which indicates a possible future condition and its result. The structure is:
If + present simple, will + base verb
In this case, the sentence is:
If you come first, you will get a good seat.
This means that if you arrive early, you have a high chance of getting a good seat.