She found it difficult to establish a new ______after retirement.
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Enterprises fail to _______to standards will face severe punishment.
Cassette tape recorders are ________now.
For an informal visit of one's home in the U.K., it is not polite to arrive early.
A. 对
B. 错
草绘圆时，可以单击（）用于结束命令。
A. 鼠标左键
B. 鼠标右键
C. 鼠标中键
D. 鼠标滚轮
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