Exercise One 1
Exercise Two 5
Exercise Three 10
Exercise Four 15
Exercise Five 20
Exercise Six 25
Exercise Seven 30
Exercise Eight 35
Exercise Nine 40
Exercise Ten 45
Exercise Eleven 49
Exercise Twelve 54
Exercise Thirteen 59
Exercise Fourteen 64
Exercise Fifteen 68
Exercise Sixteen 73
Exercise Seventeen 78
Exercise Eighteen 83
Exercise Nineteen 88
Exercise Twenty 93
Exercise Twenty-One 98
Exercise Twenty-Two 103
Exercise Twenty-Three 108
Exercise Twenty-Four 113
Exercise Twenty-Five 118
TOEFL语法答案 123