13. Those _____ are willing to help others are likely to be popular among people.
A、 whose
B、which
C、who
D、what
Directions:There are 15 incomplete sentences in this section. For each sentence there are four choices marked A, B, C and D. Choose one answer that best completes the sentenceand blacken the corresponding letter on the Answer Sheet.6–-Did you find the film boring?一-Not at all. It was _____