Why does Mary look so sad? – Maybe the things _______ she saw made her think of her grandmother.

Mary is flying to France soon. She will arrive ________ London ________ the morning of July 19. [ ]

Which subject do you like better, Chinese or Maths?— . I prefer English.

It ______two years since we ______ this school, we really like it.

Li Ping always gets up early and he is late for school.