You have probably heard the expression，Its raining cats and dogs outside.That means 1 its raining very hard I not that 2 cats and dogs are falling from the 3 .However，one day in June，1882，it really did rain 4 over Dubuque，Iowa.The frogs 20 falling along with hailstones(冰雹)during a 6 storm.
Hail is formed when drops of rainwater are 7 by heavy winds and are carried high up into the air.There the raindrops become frozen.Many drops may freeze 8 to form balls of ice;these ice balls，or hailstones，then 9 to earth.
During the storm in Dubuque，the strong winds lifted small frogs from nearby ponds(池塘) 10 the air along with raindrops.When some of these frogs became covered with ice，both hailstones andfrog-stonesfell onto the ground.
1.A.that B.how C.why D.if
2.A.careless B. blind C.dead D.real
3.A.hill B.tower C.sky D.building
4.A.cats B.frogs C.dogs D.birds
5.A.stopped B.enjoyed C.began D.forgot
6.A.popular B.terrible C.weekly D.common
7.A.divided B.added C.changed D.caught
8.A.together B.alone C.so D.almost
9.A.hold B.lose C.keep D.fall
10.A.from B.into C.after D.by