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.
Answer:
I think it is the 2nd choice
Explanation:
I hope you get it right and I am so sorry if I am not right!!
The main idea is that humanoid robots do things for the scientists that the never could.
Answer:
The answer would be conditional
Explanation:
I am pretty sure that the main idea of the Interview with Marielle Tsukamoto was Japanese American internment. During the whole interview Marielle Tsukamoto tells about how she spent her time in an internment camp, shares her ideas about American citizens, her feelings of leaving lovely place, mentioned all her saddest memories and happy moments and praises her mother, I recommend you to read this article, it’s not a big one.