Don't turn off the computer before closing all programs, ________ you could have problems.
A. or B. and
C. but D. so
I was glad to meet Jenny again, ________ I didn't want to spend all day with her.
A. but B. and
C.so D.or
It's not easy to change habits, ________ with awareness and self-control, it is possible.
A.for B.or
C.but D.so
Cathy had quit her job when her son was born _______ she could stay home and raise her family.
A. now that B. as if
C. only if D. so that
The meaning of the word "nice' changed a few tines it finally came to include the sense "pleasant."
A. before B. after
C. since D. while
Lessons can be learned to face the future, ________ history cannot be changed.
A. though B. as
C. since D. unless