Can we remove the word 'who' in this sentence?

The man who came to us yesterday was my uncle.

Only one word is incorrect in the sentence below. Write down the correct version of the word in the space provided.

It was a meeting which purpose I didn't understand.

Match each sentence with the correct explanation.

Can we omit the word 'that' in the following sentence? 

The official that I spoke to gave me all the forms I needed. 

Fill in the gap with the correct relative pronoun.

That's the woman ................. name she can never remember.

Can we remove the word 'who' in this sentence?

He is the man who intends to marry Jennifer.