These questions test your verbal reasoning skills. This includes your testing vocabulary, a logical approach, your ability to determine patterns within words and your ability to manipulate words.
(up run walk)
(smile laugh down)
The question clearly states that you are required to find two words that are opposite in meaning. It is important to read the question and understand what you are being asked to do. There is a similar question type that asks you to find two words that are closest in meaning, so be careful.
There are nine possible answers:
1 up smile
2 up laugh
3 up down
4 run smile
5 run laugh
6 run down
7 walk smile
8 walk laugh
9 walk down
Depending on your vocabulary skills it is possible to eliminate a number of options immediately. Those that are obviously not opposite in meaning: 1, 2, 4, 5, 7, 8 and 9. This leaves you with options 3, and 6.
Option 3 “up”, “down” is the most opposite. Therefore the correct answer options are A, F.
You can see that option 6 “run” “down” are not opposites, but there is a word association with “run down” that leads to a common error on this type of question. Remember you are looking for the “most opposite” in meaning not word associations.