Acartravelsatarateof50milesperhour.Howlongwillittaketotravel300miles?
—Isthereadininghallinyourschool?
—__________
Look，mygrandmotheris_____mygrandfather
letus(缩写形式)__________
努力工作(译成英语)_________
About________percentoftheearth'ssurfaceiscoveredwithwater