如图所示的电路中,电源电压不变,R1为定值电阻,开关S闭合后,滑片向右移动时
---Can I get you a cup of tea? ---_____.
---I had a really good weekend at my uncle’s. ---___.
There is ______ “h ” , ______ “o”,_______“u ” and ______ “r ” in the word “hour ”.
There is _____________sheep on the hill .
--- Could you help me , please ? --- _____________________.