有一个问题：用一根粗细不均匀、可以烧1h的绳子可不可以测出15min。
我的设想是，先从两头和中间一起烧，然后绳子应该分为两段，那么其中一段先烧完；在这一段烧完的同时立刻把另一段绳子的中间点燃，另一段绳子也会分为两段，也是其中一段先烧完，我也立刻把另一段的中间点燃……如此反复，当某一时刻两段绳子同时烧完时，过去的时间就是15min了。
这个设想有没有不合理的地方？
请用其他单词或者短语替换下面括号中的内容，并且保持句意不变。
1.It is (OK) to be 15 to 30 minutes late in some areas.
2.In foreign countries, we need to respect local （traditions).
3.I entered a chess (contest) and finished third.
4.He brought his chicken to the (market).
5.I met a childhood friend at the (party).
6.Some often throw a big party to (observe) Christmas here.
7.Students are (required) to sit in the front of the conference hall.
8.John, a tough (man), cried like a baby when he got his lost son back.
9.Jack, the (owner of this house), introduced us to the other guests.
10.Although this idea is very good, not everyone (likes it very much).
