Jack is the only one of the classmates who ______ invited.
A. has
B. have
C. is
D. are
Is this book ______ I bought for you the day before yesterday?
A. which
B. that
C. ×
D. the one
I'll remember the time ______ we spent together in the country.
A. that
B. when
C. during which
D. at which
The professor made his first speech ______ he talked about some subjects the students were interested.
A. that
B. which
C. in which
D. of which