例句： She looked up from her exam paper with a worried frown.

例句： She has also been affected, but to a lesser degree.

例句： Two blocks beyond our school was a field where boys played football.

例句： As you get older, your attitude towards death changes.

例句： He is ashamed for his former dishonorable action.

例句： If you get stomachache, you should go to see a physician.

例句： It is impossible to assign an exact date to this building.

例句： Run or else you'll be late.

例句： Riots are of frequent occurrence in this province.

例句： The conductor handed the sick man out of the bus.