【2012江苏泰州】Cross the road carefully, ____you’ll keep yourself safe.
Sally goes to visit her grandparents ________ Saturday mornings.
She read ______ books by Japanese writers. Now, she would like to read ______ books by writers from _____ countries.
Look! One of the boys ______ under the tree.
John and Peter like to __________ their life.
--_________ do you do some outdoor activities? --Once a week.