问题描述：
用适当的关系代词将下列每组句子合并成含有定语从句的复合句.
1.The medicine was quite helpful.Dr.Black gave it to my friend.
2.The man is our physics teacher.You saw him in the lab.
3.Cheese is liked by people in western countries.It is made from milk.
1.The medicine was quite helpful.Dr.Black gave it to my friend.
2.The man is our physics teacher.You saw him in the lab.
3.Cheese is liked by people in western countries.It is made from milk.
问题解答：
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