1．The research has thrown some new light on the ______(mysterious) of life.
[答案] mystery
2．A man ________(claim) to be a journalist threatened to reveal details about the woman's private life.
[答案] claiming
3．The gunmen ________(calm) walked away and escaped in a waiting car.
[答案] calmly
4．I didn't get ________ clear look at his face because of his black mask.
[答案] a
5．This ________(destroy) emotion is rarely productive and can turn best friends into worst enemies.
[答案] destructive
