1 . I wonder _________Mary has kept her figure after all these years. She is in good shape. （用适当的词填空）

2 . We will give the chance to _________ solves the problems first.（用适当的词填空）

3 . Our success depended on it ________ every team member played their own part well. (用适当的词填空)

4 . Many young people in the West are expected to leave __________ could be life’s most important decision—marriage—almost entirely up to luck.

5 . Contrary to__________many people might assume, evidence shows that sharks seldom attack humans.（按要求补全句子）

6 . It was not until dark ________ he found ________ he thought was the correct way to solve the problem.

A．when; that

B．that; that

C．when; what

D．that; what