1．Her father is an old teacher.He ________ Beijing University 20 years ago.
2．________，there are many old people in the park on Sunday morning.
3．Jane ________ Chinese food and she goes to the Chinese restaurant three times a week.
4．They ________ to buy a new house in Qingdao before they got married.
5．Hearing the hero is coming，the students ________ see him.
6．—Father still smokes heavily?
—No，he has been ________ doing it by our mother.
