Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
--- We don’t allow _________ in the library . --- So we had better _________ outside .
-- Shenzhen _________ on the coast . --- Yes . It is _________ the north of Hong Kong .
--- Why did you _________ school late today ? --- Because I _________ late this morning .
- -- What do you think of your parents? --- They are always strict ____ our studies and they often make me ______ too much homework .
-- It is often said , “ All roads _________ Rome . ” --- Yes . I’m sure if you work hard , you will be _________ .