单项选择题
he training is（）for every type of communication.
A.valueless B.invaluable C.worthless D.inworth
单项选择题 You（）a big step toward overcoming stage fright if you（）positively
单项选择题 The need for（）public speaking will almost certainly touch you sometime in your life.
单项选择题 （）he was late, he was not criticized by the teacher.
