English is ________ rather hard for me to learn.
A. sometime
B. some time
C. sometimes
D. some times
What ________ you when I rang you up yesterday?
A. are; doing
B. were; doing
C. do; do
D. have; done
You must tell us what you ________ at ten last night.
A. did
B. was doing
C. were done
D. were doing