根据下列句子及所给单词的首字母写出所缺单词。在填写答卷时，要求写出完整单词。 (每空限填一词)

小题1:He is very smart．He went to university at the a   of 15．

小题2:Never cross the street when the traffic lights are r   ．Wait until it’s green．

小题3:It doesn’t look like rain，so you needn’t b     your umbrella with you．

小题4:I miss my family and really feel l     without any friends in this new city．

小题5:Where is my watch?I can’t f     it．

柴油发动机曲轴的大修标准中心线径向圆跳动是（）mm。

A、≤0.05

B、≤0.01

C、≤0.50

D、≤0.02