---Why does she always ask you for help?---There is no one else _______, is there?A who to turn to B she can turn to C for whom to turn D for her to turn
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.