Adjective clause

I enjoyed ESL class. I took it last quarter. 

Combine these two sentences making  second one into an adjective clause .

( who)   (whom ) which (that ) and blank.

(1) I enjoyed ESL class which i took last quarter 

(2) I enjoyed ESL class that i took last quarter 

( 3) I enjoyed the ESL class I took last quarter . (Blank)

The book was about the beginning of the universe I read it last night

* The book which I read last night was about the beginning of the universe 

* The book that I read last night was about the beginning of the universe.

* THe book I read was about the beginning of the universe.

Mr. Norman whom  I took ESL 253 with , taught me a lot . ( I took ESL 253 with him ) 

The teacher whom I took last quarter taught me about grammar.

My mom , whom i saw yesterday , brought me dinner.

My mom , who got her covid vaccine in February, was so happyto be able to spend time with her family.

(Book= thant / which ) 

My friend who has two boys works from home.

Lacie, who has two boys, works from home.

My best friend is a nurse . She lives in Oregon.

My best friend who lives in Oregon is a nurse. ( How many best friend does a person have ? )