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1．________ an hour every day has made a considerable difference to my health. A．Having walked B．Walk C．Walking D．Walked 2．Today we have too many choices of communication through advanced technology，but we seem ________ the joy of communicating face to face. A．losing B．to be losing C．to be lost D．having lost 3．Nobody but doctors or nurses and those ________ by Dr.Li ________ to enter the patient’s room. A．being invited；allowed；are allowed；is allowed；are allowed________ often enough. A．explaining B．to explain C．explain D．explained 5．With the couple ________in a nearby town，the house seems pretty empty most of the time. A．work B．to work C．working D．worked 6．—Why do you look sad? —There are so many problems ________．mained to be settled 7．—Hi，Mary.Would you like to go to the concert this evening? —Sorry，Tom.________ tomorrow’s lessons，I have no time to go out with you. A．Not preparing B．Not having prepared | 
