5.In each of the following groups of words, there are four underlined letters or letter combinations marked A, B, C and D. Compare the underlined parts and identify the one that is different from the others in pronunciation.
A、easy
B、noisy
C、busy
D、fantasy
If John had entered the office ten minutes ago, he____ what we were talking about just now.
A、should know
B、had known
C、would know
D、would have known
It is expected that by 2049 the population of the city ____ two million.