When I walked past the park, I saw some old people _______ Chinese Taiji.
––Were your two friends at home yesterday? ––No, We ______went to Hangzhou Park.
I’ll never forget the days ____ I spent with my grandma in the countryside.
-I saw Mark on the playground just now.–No, it _______ be him. He is ill in bed at home.
You can’t imagine _______ when they received these nice New Year presents.
________ a beautiful car! I’ve never seen it before.