Need help asa Thanks + BRAINLIST only if you know correct answers for these questions

1) The three pairs of jeans that Maktoum boughton sale at 50% off the original price.
a. was
b. were
2) The skilled doctor and his caring nursesresponsible for my grandmother's fast
recovery.
a. was
b. were

3) Which sentence has the wrong subject-verb agreement?
a. One of our students was awarded by the local government for an amazing Science project.
b. One of our students were awarded by the local govemment for an amazing Science project.

4. Which sentence followed the rule on subject-verb agreement correctly.
a. Neither the class president nor the class representatives was present in the bake sale.
b. Neither the class president nor the class representatives were present in the bake sale.

5) Which sentence used the correct one for the frequently confused words coarse and course?
a. Frequent swimming made Saif's hair very coarse.
b. Frequent swimming made Saif's hair very course.