20、--- It’s the office! So you ______ know smoking is not allowed here．

--- Oh, sorry．

A．must               B．will                  C．may                D．need

19、The teachers were discussing the research project that they would like to see _____ in the coming holiday．

A．complete                 B．completed               C．completing              D．to complete

18、The factory was built in a secret place, around _____ were high mountains．

A．where             B．it            C．that           D．which

17、--- I hear Jane has gone to the Holy Island for her holiday．

--- Oh, how nice! Do you know when she ______ ?

A．was leaving               B．had left            C．has left           D．left

16、They were surprised that a child could work out the problem ______ they themselves couldn’t．

A．once                B．while              C．then           D．if

15、______ from what he said, he must be the thief who has stolen the car．

A．Judging           B．Judged            C．To judge           D．Judge

14、The house is nice, but ______ too small for a family of five．

A．rarely           B．fairly        C．rather         D．pretty

13、One of the most important problems we will have to solve is _______ of students’ learning method．

A．that          B．this           C．what            D．which

12、The system is designed to give students easy ______ to the digital resources of the library．

A．passage          B．way           C．approach         D．access

11、Where we will build the dam has not been decided yet, ______?

A．will we          B．has it          C．won’t we         D．hasn’t it