(2012年重庆联合诊断性考试)It is rather difficult to make friends with him,but his friendship,________,is more true than any other's.
________ at the door before you enter my room, please.
________ with care, one tin will last for six weeks.
— Can I have a day off tomorrow, Mr. Johnson? — ________. I can manage without you.
—Why not have a birthday party for our mother? —________.
—Do you know the boy ________ is sitting next to Peter? —Yes.He is Peter's friend.