I believe it's wanting you to use the context of the sentence to determine the correct type of verb of motion (unidirectional or multidirectional, also known as definite/indefinite). I'm assuming the exercises has blanks (ellipses, rather) where a verb would fit. So it wants you to determine whether you use идти or ходить, бегать or бежать, плавать or плыть, etc. Are the verbs already supplied in the sentence, or do you have to identify that too?