Помогите с английским пожалуйста

20. Who ... ?
a. do you think he is
b. is he do you think
C. -is he, how do you think
d. - he is, what do you think; у'
21. “Didn’t you use to live in Wales?”
a. Yes, I did.
b. No, I did
c. Yes, I used
d. Yes, I didn’t
22. I’m not stupid, ....
a. and neither is my sister
b. but so is my sister
c. and so isn’t my sister
d. but is my sister