一、1—C 2—A 3—B 4—D
二、题目略 1.hers; Yours 2.its 3.Our; Theirs; ours 4.his 5.My
三、题目略
1.hers
2.The books are his.
3.They are Sarah and Sam's toys. The toys are theirs.
四、1.A 2.C 3.C 4.C