1.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、game
B、late
C、trade
D、have
Pets____constant care are not suitable for people with little spare time.
A、require
B、requiring
C、required
D、to require
The old man's clothes, ____ old and worn, looked clean and of good quality.