82.　 In America you can buy a used/secondhand car for as little as 300dollars.

81.　 When their cars become old, they prefer to buy a new one rather than repair it.

80.　 There will be hardly enough space for anybody else/

79.　 We can also use satellites to help us make telephone calls for foreign countries.

78.　 Man-made satellites have been sent up into space by many countries.

77.　 Spaceships without people have reached other parts of the universe.

76.　 I hope I can make my own computer that way someday.

75.　 All beepers and mobile phones must be kept off during the concert.

74.　 Children under 1.2m in height cannot be taken into the concert hall.

73.　 There are twenty more trees to be planted. =There is another 20 trees to be planted.