My brother likes eating very much but he isn't very _____ about the food he eats.
She felt very upset ___________ what her deskmate said. A because B because of C as if D unless
When the expression first came into being, people refused (拒绝)to use it but _____ they began to accept it.
Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
---Mike, please don’t forget to turn off the light when you leave. ---Pardon? ---I ________ forget to turn off the light.
It is so nice to hear from her. _______, we last met more than thirty years ago.