Complete the sentences with relative pronoun: who, whom, that, which

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Exercise 5: Complete the sentences with relative pronoun: who, whom, that, which.
1. Tom made a number of suggestions, most of
were very helpful.
2. Mart has three brothers, all of
are married.
3. We were given a lot of information, most of
4. There were a lot of people at the party, only a few of
5. I sent her two letters, neither of
6. I have two sisters, both of
7. He lent me many picture-books,
are doctors.
most of
was useless.
she has received.
I had red.
I had met before.