Answer:
See explanation below.
Step-by-step explanation:
Underlining doesn't come through in questions. I cannot see which words are underlined in your questions.
I am going to take a guess at the underlined words.
For #40, I am going to guess that the underlined word is annually. If that's true, the answer is C, once a year.
For #41, I am going to guess that the underlined words are takes place. If that's true, the answer is B, occurs.