Understanding the cultural habits of another nation, especially ____________ containing as many different subcultures as the United States, is very difficult.
Not until the train pulled into the next station _______her suitcase gone.
The heavy fog in London made _______deep impression on us, which was sometimes so heavy that we lost ________sight of everything.
Thegovernmentshouldprotecttheoldvaluablebuildings____theyarenotin harmonywiththemodernonesnearby.
We used to see each other, but I haven’t heard from him since last year.
Dr.Smith as well ashisdaughters,visitBeijingthissummer.