A friend is a person ______ you know very well and like very much.
A. who B. which C. whose
–Do you know ______?
--Yes. It’s a ball.
A. why she brought the box
B. what is in the box
C. how much the box is
It’s time ______ home now.
A. go B. goes C. to go
–I ______ know you can play the piano so well.
--Thank you.
A. didn’t B. don’t C. can’t
These are my parents. They ______ workers.
A. am B. are C. is