【华慧考博】考博英语每日一练（8.28）考博加油！
1. They______ the floor until the timber had turned white.
A. swept
B. scrubbed
C. dusted
D. tidied
2. Personal computers are no longer something beyond the ordinary people; they are ______available these days.
A. promptly
B. instantly
C. readily
D. quickly
【补全句子】
1. We often use “x” to _________ _________ an unknown number while doing maths exercises. 当我们做数学题时，我们经常用 X 来代替未知数。
2. He has not only finished his own work, but helped others_________ _________. 他不仅自己完成了他自己的工作，也帮其他人完成了。
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