------ Who is that man over there? _______ it be our teacher?------ No, it _______ not be our teacher. It _______ be Mr. Zhang.
"Will you _______ us in the discussion ", she asked us. A join in B join C take part in D take part
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.