So much of interest ________ that most visitors simply run out of time before seeing it all.

What have you learned from your experience in Thailand?—Well, meeting people from another culture ______ be very difficult．

Why the explosion occurred was____the laboratory attendant had been careless.

下列诗句所写的传统节日依次对应恰当的一项是（ ）①遥知兄弟登高处，遍插茱萸少一人。 ②借问酒家何处有牧童遥指杏花村。③但愿人长久，千里共婵娟。 ④迢迢牵牛星，皎皎河汉女。

I can’t believe you got fined for speeding．I of you to be the most careful．