Pets____constant care are not suitable for people with little spare time.
A、require
B、requiring
C、required
D、to require
The sweater she received in the end differed ____ the one she had seen online.
A、by
B、in
C、with
D、from
4.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.