Where ______ the keys— _______ on the sofa.

I am ________ endless examinations.— Cheer up, David.Keep on until the college entrance examination ends. [ ]

I’m really tired _______ TomHe had me _______ for two hours in the rain

Excuse me，can you tell me what the weather is like in Beijing in winter—It’s ___________，so put on your warm clothes.

I was about to inform you of the sudden change ______an unexpected visitor came.