请教两道英语选择题：the children are

请教两道英语选择题：the children are
请教两道英语选择题：the children are not allowed in until the school bell rings,（ ）the weather.
a whichever b whatever c however d wherever
( )he has missed his chance,he"ll have to wait for the next round.
a now that b even though c so that d as long as
不要只讲答案，请讲一下几个词汇的区别和用法。
还有问题： my pleasure 和 with pleasure 和 it"s a pleasure 的意思是什么？