It’s _____ hard problem for the twins that ____ of them can work it out.
Baby giant pandas ________ a lot of time ________ their mothers’milk every day.
Excuse me. I _______ I was blocking(挡) your way.
Her shoes are _________ mine.
—When did your school hold the sports meet? —Last week. And I _______ the girls’ 400-metre race.
Miss Wei often helps us ________ our English.