21. – Isn’t the girl who talked to you kindly your sister?
–. She is my English teacher.
A. Yes, she isn’t B. No, she is C. No, she isn’t D. Yes, she is
22. When and where to go for the holiday __________ yet.
A. are not decided B. have not been decided
C. is not being decided D. has not been decided
23. Now day breaks, ________ the birds are singing.
A. because B. for C. since D. as