Sam ________ some knowledge of the computer just by watching others working on it.
--- Has Mary come back yet? --- Yes. She has got many books from her elder schoolmates, and the number ___ 1000.
"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.