76． _________　 77． __________　 78． ________　 79． ___________　 80． ___________

70． The river is 3000 miles in l_________．　　　　　　　　　　 　 　70．___________

69．The car is running at a s_________ of 100 miles an hour．　　　 　　69．___________

68．Sorry, I can’t afford the car． It’s too e__________．　　　　 　 　68．___________

67．When I told them the funny joke, they couldn’t help l _____ ．　　 　67．___________

66．___________

根据句义完成已给出首字母的单词。将每个完整的单词写在各小题右边的横线上。

66．We waited for ten minutes in the restaurant, but no waiter came to s__________ us．