71. won-->lost
72.should-->will
73. although-->so
74. say-->tell
75. play a lot of-->bỏ đi
76. My brother is a good football player.
77. Badminton is Mai's favourite sport.
78. Sports and games play an important part in children's lives.
79. Children do many after-school activities when school finishes.
80. Lan can play basketball very well.

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#answeredbyme

@ỉn

$\text{71. won-->lost}$
$\text{72.should-->will}$
$\text{73. although-->so}$
$\text{74. say-->tell}$
$\text{75. bỏ play a lot of}$
$\text{76. My brother is a good football player.}$
$\text{77. Badminton is Mai's favourite sport.}$
$\text{78. Sports and games play an important part in children's lives.}$
$\text{79. Children do many after-school activities when school finishes.}$
$\text{80. Lan can play basketball very well.}$