His last year's trousers are now outgrown and need ______．去年的裤子他已经穿不得了，需要加长一点。
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The whole nation was ______ when news came that China's first man-made satellite had been succes
火焰除锈金属表面预处理质量等级为（）。
A. F1
B. Pi
C. Sa3
D. Sal
He resumed his regular working hours ______ after he came out of hospital．
他出院不久就恢复了正常工作。
有五条线段，其长度分别为1、3、5、7、9，从中任取三条，能构成三角形的概率是（）。
A. 1/4
B. 3/10
C. 1/2
D. 7/10
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