54. It's very cold outside. You should put on more clothing to ______, otherwise you will catch bad cold.
Hearing the boring news, I was too distracted (心烦意乱)tomy attention on my homework.
Tom was ______ that he couldn’t understand ______ difficult sentence.
—Do you know Ann Watterson very well? —Yes, she used to be ______ coach and in ______ charge of our school team.
—Do you mind if I smoke here? —______ I feel a bit sick.
She tried to stay calm on the stage, but her trembling voice _______ her nervousness.