It has been accepted that all the students ____ put on masks before going to school in case they are infected with flu virus.
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.