Can I help you, madam?— Yes, I bought this air conditioner here yesterday, but it _____ now

It worried Mary a lot__________she would pass the college entrance examinations.

Even on a cold day he prefers ______ out to play football ______at home．[ ]

How do you improve your listening skill— I often do it ________ tapes and English radios.

To some people living in Shanghai, the face of Shanghai may have changed, ________ the heart of it remains the same.