I could tell he was surprised from the ________ on his face.
A. appearance B. view C. sight D. expression
--- Has Mary come back yet?
--- Yes. She has got many books from her elder schoolmates, and the number ___ 1000.
A. adds up B. adds up to C. add to D. add up to
"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.
A. usually B. gradually C. entirely D. quickly
Scientists say it may be five or six years _______ it is possible to test this medicine on human patients.
A. since B. after C. before D. when
