You did not include options in your question, but based on the meaning of the word cryptic, your answer will be 'A HIDDEN MEANING'.
When you say that something is cryptic, it means that, that thing has a meaning that is mysterious or obscure.
From the way the word was used in the given sentence, it means that the message the teacher was passing across about the test is hidden, it was not understood by any of the students.
The first one melancholy.
I hope this helps :)
Answer: You didn't include the article, but I can kind of guess?
Explanation: He believes that all teenagers go through something, and he tells adults to help them, instead of just thinking of them as moody teenagers.
Answer:
Arguments need evidence because evidence is the concrete fact to support your claim without it your argument is just an opinion and nobody will take it serious if it is not supported with evidence then your audience will not support your claim.
Explanation:
The speaker had an unpleasant experience of America and had a negative first impression. This feeling stayed with the speaker even after the event.