The verb in the sentence is, to follow (his father's footsteps). This verb is used as an infinitive. An infinitive is a word in the verb form that functions as a noun, adjective or adverb. Infinitives are generally introduced by the word "to".
Your first option, "I have taken all the stress I can stand.", is a line of dialogue.
Dialogue is speaking/talking. The second and last options cannot be examples of dialogue because they are not being spoken (you can tell by the lack of quotation marks).The third option is also incorrect because it is what is written, as it says "the study reported" (the study does not speak). Therefore, the first option is correct.
She is crying. The verb cry is both transitive and intrsitive. As "cry" is intransitive or there's no object in the sentence presented, you cannot change the sentence into the passive voice. Look at the following example in which the cry has been used as a transitive verb: The mother cried tears of joy when she found her child.
Answer:
Surely observe and hypothesize.
Explanation:
In principle, every scientist always follows the steps of the scientific method, that is, in the beginning formulate the problem, then observe and formulate possible hypotheses.
