please leave here __once and never do it again Robert often helps his neighbors__their housework
问题描述：
please leave here __once and never do it again Robert often helps his neighbors__their housework
I helped Stella__when she became ill.
If I had one million dollars,I would donate it __charities
答
at ；at once立刻,马上
with；.help with 帮助.做.
不填
to;donate ...to...向.捐献.的意思