Modern forms of transportation and communication have done much to ______ the isolation（隔离）of life in Alaska.
A．break down B．break out
C．break into D．break through
If you don’t try your best to learn all subjects, you will ___ behind.
A．stay B．leave C．fall D．remain
Entering the room,I found Mary____ at the desk and____ a letter.
A．seated;wrote B．sitting;written
C．seating;writing D．seated;writing
——Ms Lin looks rather a kind lady.
——But in fact she is cold and hard on us. You ____ believe it!
A．shouldn’t B．wouldn’t C．mustn’t D．needn’t
---How did your students express their thanks to you on Teachers’ Day?
---A gift together with many flowers _______ sent to me .
A．is B．are C．was D．were
Mr. Li doesn’t think that all bad language should be allowed. In his opinion, there are ______ that should be kept up.
A．degrees B．levels C．limits D．standards
