Unlike most of the ESL Blues quizzes, this one does not offer feedback. Sometimes there is a logical explanation for the choice. For example, AT with time, IN with years, times of day, ON for days and dates. At other times there is none. These quizzes, repeated, will give you a lot of practice which, as they say, makes perfect.
The timer gives you 15 seconds to find the answer. It notes your errors but it only shows you the correct answers at the end.
If you don't use the timer you see the correct answers immediately and in many quizzes you can click on Another example to see a similar word or sentence.