1.It's good manner to wait ------------------- line.A.in B.on C.at D.with2.It's not an important party,you needn't-------.A.pay for it B.wear it out C.try it out D.dress up for it3.Stamps --------by people for sending letters.A.use B.using C.used D.a

1.It's good manner to wait ------------------- line.A.in B.on C.at D.with2.It's not an important party,you needn't-------.A.pay for it B.wear it out C.try it out D.dress up for it3.Stamps --------by people for sending letters.A.use B.using C.used D.a
1.It's good manner to wait ------------------- line.A.in B.on C.at D.with
2.It's not an important party,you needn't-------.
A.pay for it B.wear it out C.try it out D.dress up for it
3.Stamps --------by people for sending letters.
A.use B.using C.used D.are used

1.It's good manner to wait ------------------- line.A.in B.on C.at D.with2.It's not an important party,you needn't-------.A.pay for it B.wear it out C.try it out D.dress up for it3.Stamps --------by people for sending letters.A.use B.using C.used D.a
1.It's good manners to wait in line. （A）= 排队（才）是礼貌的行为.
2.It's not an important party, you needn't dress up for it. （D）
这不是什么明星的晚会,你不要穿上特殊服装 = It's a simple party, no need to dress fancy 的意思.
注意：*party 是 晚会,聚会的意思,important 在这里的意思是不要紧张,不是什么高级宴会或明星举行的
3.Stamps are used by people for sending letters. （D）
邮票是用来寄信的 的意思 = People use stamps to send letters .
注意：第 3 只能用 be used,是英语人比较喜欢用的被动式 (Passive tense)
1,2 都是用固定短语
wait in line 不是 排除 是 排队 = queue, wait in a queue 的意思
dress up for a party 也是短语 = 打扮,穿上盛装 的意思
wait 的短语还有：
wait on somebody = 服侍, 伺候, 招待顾客
或者 wait for somebody 等人,expect somebody to come 的意思