（１）I play tennis twice a week.
（２）We walk about four kilometers an hour.
（３）The sun sets in the west.
（４）Look at the moon!
（５）She plays the piano very well.
（６）I study English every morning.
（７）I go to school by bus.
（８）I play baseball every day.
（９）He goes there once a week.
（10）She plays the violin twice a week.
（11）He eats supper at seven in the evening.
（12）He goes swimming on Sundays.
（13）We play volleyball every Saturday.
（14）She goes shopping by bike.
（15）He likes science.
（16）She plays the piano three times a week.