根据中文提示，完成下列句子

小题1:（据说）                his grandmother died last year.

小题2:After hard working for some years,his dream              （变成现实）.

小题3:When you             （与……..干杯）somebody,you should raise your glass .

小题4:Can you                （切碎）these apples.

小题5:We study hard now             （为了）have a bright future.

交流发电机的硅二极管具有（）特性，有阻止反向电流的作用，所以不需要另设逆电流截流继电器。