Eight o’clock is __________ good time to phone Nick: he’s always at home in __________ evening.
Correct answer: GET
Good time is an indefinite singular noun, so we use the article “a”.
Evening must go with the article “the”
=> Eight o’clock is a good time to phone Nick: he’s always at home in the evening.
Eight o’clock is a good time to call Nick: he is always at home in the evenings.
The answer to choose is: GET