... publicbuildings, on any public transportation ( including airplane flights within the UnitedState), in shops, in movies theaters, schools, and office buildings. The general rule isif you are indoors, ... been finished/ arrived B. have finished/ arrivedC. had finished/ were arriving D. have been finished/ were arrivedCâu 19: Higher education is very importance to national economies, and it is also ... movement with your hands as ifyou are signing a piece of paper. It is all right to point at things but not at peoplewith the hand and index finger. Americans shake their index finger at childrenwhen...