(2013·新课标全国卷Ⅰ)At the last moment, Tom decided to ________ a new character to make the story seem more likely.

 After a day’s hard work, Mary went to the nearby shop to _____ herself to a strawberry ice cream.

 It took us several hours to make the old man ________ of the safety of travelling by air.

To avoid           on how to use the word, you’d better refer to a dictionary.

The fear of failing exams can cause you to panic and stress can be a（n）＿＿＿＿to yourperformance at school．