根据括号内所给单词的适当形式填空。

小题1:            (lucky), I finished my work on time.

小题2:Are there any _______ _  (sheep) on your uncle’s farm?

小题3:I can hear the children               (sing) in the classroom.

小题4:We went             (camp) in a small village in India.

小题5:– What did you do last Sunday ?

– I ________ (study) English at home.  

在测量电压时，万用表如何与被测线路或电器设备相连接？