1 . They felt ________ it was high tax and low income ________ contributed to the extreme misery of the working people at the bottom of the ladder.

A．/；that	B．that; which
C．that; what	D．/; which

2 . It is _______ he often fails in exams ______ makes his parents worried about him.

A．what； that	B．that； what
C．that； that	D．/ ； that