语法填空
Swedish businessman Nile Bergqvist is delighted with his new hotel, the world's first igloo(冰屋) hotel.
____ (build) in a small town, it has been attracting lots of visitors but soon the fun will be over. In two weeks' time，Bergqvst's ice creation ____ (be) nothing more than a pool of water. “We don't see it as a big problem,” he says. “We just look forward to ____ (replace) it.”
Bergqvist built his first igloo in 1991 for an art exhibition. It was ____ successful that he designed the present one, ____ measures roughly 200 square meters. Six workmen spent more than eight weeks —piling 1,000 tons of snow onto a wooden base；when the snow froze, the base ____ (remove).
After their stay, all visitors receive a survival certificate recording their success. ____ no windows, nowhere to hang clothes and temperatures below 0°C, it may seem more like a survival test ____ a relaxing hotel break. “It's great fun,” Bergqvist explains, “as ____ as a good start in survival training.''
The ____ (popular)of the igloo is beyond doubt：it is now attracting tourists from all over the world. At least 800 people have stayed at the igloo this season even though there are only 10 rooms.
＝a＋bi(a，b∈R)，则a＋b的值是( )