lt'sp_____thatl'iigowalkinginsteadofswimming
manystoriestoldhowbravedogshelpedpeopleint______.
ltwassentupinamanmadeearthsatellitein1957byR_____scientist.
dogscanh____ands______betterthanman,buttheycannotseesowell.
还有两题
dogshavebeenman'sgoodfriendsfort_______ofyears.
adogmayl______forabout12or13years.