There ___ an eraser and some books on the desk.

What’s up, Mum?—Your room is ________You’d better get it tidied up.[ ]

下列各句中，没有语病的一句是

_______ review of 44 studies, American researchers found thatmen and women who ate six key foods daily cut the risk of __________ heart diseaseby 76%.

Why weren’t you at the meeting? — I ________ for a long distance call from my sister in America