It was quite a job for her to ____ several children all by herself during the war.
| A．dress up | B．bring up | C．tie up | D．add up |
About 85％of the Australian population of 20million______in the six major cities around the coast nowadays
| A．has lived | B．live | C．1ivcd | D．1iving |
Every family in America has had this sort of experience______there was a price increase of nearly one-third in the past two years
| A．that | B．which | C．what | D．when |
Polar bears live_______ on sea ice，which they use as a platform for hunting seals
| A．most | B．almost | C．nearly | D．mostly |
______everybody enjoys fresh cut flowers around his house．few people know how to keep them for as long as possible．
| A．Because | B．Since | C．While | D．If |
Scientific surveys conducted during the climbs ______that Mount Huandoy in Peru______ 6395 meters high
| A．shown；is | B．showed；was | C．shows；was | D．showed；is |