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11. She had three sons, all ______ became doctors.

A) of which B) which C) of whom D) who

12. Have you bought the same dictionary ______ I referred to yesterday?

A) that B) which C) what D) as

13. The doctor ______ stepped in.

A) Della was waiting for him

B) whom Della was waiting

C) Della was waiting for

D) who Della was waiting

14. I want to buy such a dictionary _____ you bought last week.

A) that B) what C) like D) as

15. This is the TV station ______ we visited last year.

A) Where B) that C) to which D) in which

16. Do you still remember the days ______ we spent together in Australia?

A) when B) during which C) which D) on which

17. Have you ever asked him the reason _____ may explain his absence?

A) why B) when C) that D) what

18. Mary is good at English and mathematics, ______ we all know very well in our school.

A) that B) what C) / D) as

19. Let’s go and visit Mr. Brown, ______ you know visited us last year.

A) that B) who C) whom D) whose

20. She is pleased with ______ you have given her and ______ you have told her.

A) that/that B) what/that C) what/all what D) all/what