接地线在穿越墙壁、楼板和地坪时应套钢管或其他非金属的保护套管，钢管应与接地线做电气连

用方框中所给的单词的适当形式填空，每个单词限用一次。

Busy      swim      hardly      three      ourselves

小题1:Father’s day is on the __________Sunday in June.
小题2:The traffic during the rush hour is much __________than usual
小题3:We must learn to look after __________ when we are alone at home.
小题4:_________is good or our health.
小题5:When I got to the top of the high mountain，I could__________ walk any more.