One of the most terrifying elements of the TOEFL is the speaking part, because it is a weird setting where you have to give a answer with a clock ticking.
The first question has 15 seconds preparation and then you have to speak for 45 seconds.
Often it follows a pattern where you should give a one sentence answer, followed by 2 reasons why and then ideally followed by a conclusion (depending on available time). It is good to practice with using a conclusion. If you get cut off in the conclusion that is not too dangerous, more harmful if to have 10 empty seconds in the end of your speaking.
These questions you have to practice, so you will not panic on the test. For example, if there is no way you manage to think of two reasons for your answer, you can be prepared and save the situation by giving two examples to the first reason.