What’s the matter with John He has been sitting there for hours.—A postcard from his father ______ an attack of home-sickness in him.

Jenny goes to school on foot．Ittakes her about half ____ hour to get there． A．an

Expensive restaurants are not_________ the best.

The new online library makes possible for students to choose books by smart phone off campus

Merry________ B．has worked C．is working D．works