16 the danger had not yet passed.The terrible 17 -|||-came when he had to land.Following 18 the man guided the plane toward the airfield.-|||-It shook violently 19 it touched the ground and then moved rapidly 20 the runway-|||-and after a long run it stopped safely.-|||-() 1.A.although B.while C.therefore D.then-|||-() 2.A.shifted B.thrown C.put D.moved-|||-() 3.A.showed B.presented C.exposed D.appeared-|||-() 4.A.well B.still C.calm D.quiet-|||-() 5.A.inquired B.insured C.informed D.instructed-|||-() 6.A.fallen B.failed C.faded D.fainted-|||-() 7.A.best B.least C.length D.first-|||-() 8.A.hesitation B.surprise C.doubt D.delay-|||-() 9.A.back B.aside C.about D.off-|||-() 10.A.patient B.anxious C.urgent D.nervous-|||-() 11.A.beneath B.under C.down D.below-|||-() 12.A.to B.by C.near D.on-|||-() 13.A.horror B.trust C.pleasure D.relief-|||-() 14.A.surround B.circle C.obscrve D.view-|||-() 15.A.intimate B.familiar C.understood D.close-|||-() 16.A.Then B.Therefore C.But D.Moreover-|||-() 17.A.moment B.movement C.idea D.affair-|||-() 18.A.impression B.information C.inspections D.instructions-|||-() 19.A.as B.unless C.while D.so-|||-() 20.A.around B.over C.along D.above