Answer: If his plan is going to work.
Explanation: Clearly Jack is using STEM for his plan so making sure that his plan works could possibly be the answer. I mean if you were creating a project you would want to make sure that it works and that you checked your STEM skills to go forward with the plan.
Yield to the vehicle On the left
Finally one i can answer. The answer is Idiom
B. feels, an action verb has to be an action that is happening, and is the subject of the sentence, so here it would be feels.
