Do you have any plan for this summer vacation, Mary?— Sure, I’ d like to be a volunteer and help to ______ the Central Park.

Whose book is this? There is no name on it.—Let me see. Oh, it’s . I lost it a few days ago.

What does your brother look like?–He is.

To tell ______ truth, he is at ______ loss what to do currently．

We should stop people from_____ the street when the light is red.