Theassociationis________toraisingfundstohelptheblind.
SinceWilliamhadbeenseriouslyillforseveralmonths,hisparentswereworriedabout________toreturntoschoolfull-time.
Idon'tknowhowwecanmake________onthetimetableforanymorecourses.
1956年我国在社会主义改造基本完成后,开始进入______。
曲线y=|x|与直线y=2所围成的平面图形的面积为()