The man________visited our school yesterday is from London.
A.who B.which C.whom D.when
The woman________is talking to my mother is a friend of hers.
A.whose B.who C.whom D.which
Because of my poor memory,all_________you told me has been forgotten.
A.that B.which C.what D.as
Do you remember those days_________we spent along the seashore very happily?
A.when B.where C.which D.who

The man________visited our school yesterday is from
London.
A.who B.which C.whom D.when

The man who visited our school yesterday is from London.

这个who 是形容man 的， 是主语。 which 是形容一样东西或一件事。whom 是形容人的，但是它是谓语。 when 是什么时候。

The woman________is talking to my mother is a friend of
hers.
A.whose B.who C.whom D.which

The woman who is talking to my mother is a friend of hers
跟第一题是差不多的。

Because of my poor memory,all_________you told me has been forgotten.
A.that B.which C.what D.as

Because of my poor memory, all that you told me has been forgotton.

that 是说这事的。它不能代替人。

Do you remember those days_________we spent along the seashore very happily?
A.when B.where C.which D.who

Do you remember those days when we spent along the sea shore very happily?

这句话是说一件事在一段时间完成的。when　是说时间的。