I am _____ about what I say because careless remarks are likely to hurt others' feelings.
Walking alone in the dark, the boy whistled to ________ his courage.
Finally, my thanks go to my tutor, who has offered a lot of suggestions and comments on my paper and ________ every page of my draft.
(2012浙江卷) According to scientists, our mental abilities begin to______ from the age of 27 after reaching the highest level at 22.
(2014届河南省豫东豫北十所名校高三上学期阶段性测试) I'm really concerned ahout you. If something _______ happen to you call me at once.
(届河南省郑州市第四中学高三上学期第六次调考)Tony ________ full marks, but he was so careless as to make a spelling mistake.