think的形容詞是什么

　　It was very thoughtful of you to send the flowers.

　　你送花來，想得真周到。

　　This intriguing book is both thoughtful and informative.

　　這本引人入勝的書既有思想性又有知識性。

　　Nancy, who had been thoughtful for some time, suddenly spoke.

　　南希沉思半晌后，突然開口說話。