Only when all the fish in the lake died _____ how serious the pollution was.[ ]

Having worked for as long as ten hours, theyoung man lay on the ground, _____.

These are your English books. But where are ________

__a high percentage of Australians may be people who watch sports rather than dothem, as far as most of its population is concerned, it is indeed a greatsporting nation

依次填入下面一段文字横线处的语句，衔接最恰当的一组是（ ）家乡有一条河，曲曲弯弯，河中架一弯石桥弓形的小桥横跨两岸。_____________，___________。________________，______________。______________，_____________。①弯弯小桥，不时荡过轻吟低唱②不时露出舒心的笑容③那是家乡人为了追求多棱的希望④每天，不管是鸡鸣晓月，日丽中天⑤还是月华泻地，小桥都印下串串脚迹，洒落串串汗珠⑥兑现美好的遐想