第1个回答 2010-05-30
we keep it in mind all time that we cannot throw rubbish about.
第2个回答 2010-05-30
we should remember not to throw rubbish any moment本回答被提问者采纳
第3个回答 2010-05-30
We should remember all the time not to litter around.
第4个回答 2010-05-30
At all times we should remember not to litter.