71.We are living in an age ________many things are done on computer.
72.The Science Museum, ________we visited during a recent trip to Britain, is one of London’s tourist attractions.
73. ________makes this shop different is that it offers more personal services.
74.What the doctors really doubt is ________my mother will recover from the serious disease soon.
75.As it reported, it is 100 years________Qinghua University was founded.
76. ________scientists have learned a lot about the universe, there is much we still don’t know.
77.He was sitting there, ________ (lose) in thought.
78.When_________(complete), the museum will be open to the public next year.
79.With the help of high technology, more and more new substances________________
(discover) in the past years.
80.We haven’t moved into the new office building---it _______________(decorate) right now.
71.when 72.which 73. What 74.whether 75.since 76.Although 77.lost 78.completed 79.have been discovered 80.is being decorated