依次填入下列横线处的词语，恰当的一组是（ ）泰姬陵是莫卧儿王朝君主沙贾汗为其宠妃蒙泰姬修建的 。这是一座 着宝石的伊斯兰建筑。后来，泰姬陵成为世界文化遗产。 在今天的众多的世界文化遗产中，它也是 的。

______ a little more time to think, he might have acted more sensibly.

Mr. Green _______ his lessons when I went into his office.

It has come to my notice _______ some of you have missed classes

Do you often visit your grandparents?　— Mmm… ________ , I’m afraid. I usually phone them.