251. The America’s selling weapons to Taiwan cast a shadow on the Sino-U.S relationship. Which of the following can explain the underlined part?
We are so sorry for that.We'll try to determine exactly _________ went wrong that evening.
If you go there by ____train ,you can have quite a comfortable journey ,but make sure you get ___fast one.
Visitors were _____at the _____pictures that the guide showed.
【— I think my child’s behavior is _______. — No, he just has a lot of energy.
He is a foreigner and he is not accustomed _______like that while he is tn China.