Your attention, please! ________ today is Professor Yu Dan from Beijing Normal University.
She is late. What _____have happened to her? A should B must C can D would
.We were all waiting for you .You _____for the seaside by yourself without leaving a message.
----Will Mr. Smith join us in the party ? ----He would, but he _____not . He sometimes likes to stay alone. A must B can C need D may
The notice ______ “No smoking”. A is told B reads C tells D is read
The doorbell had been ringing for several minutes before it ______. A answered B had answered C was answering D was answered