Susan started to clean the room; __________Lily was preparing lunch.

A. however           B. but             C. meanwhile            D. when

 Had you joined the caht room ten minutes ago, you would have known what we _______about then.

A. had talked          B. have talked       C. talk                 D. were talking

 It is too bad for someone in such a high _______ in the government to behave badly in public.

A. position           B. situation          C. profession        D. condition

 ----Why are your hands so dirty? 

----I ____________in the garden.  

A. was working       B. have worked       C. worked          D. have been working

 If I can help ____, I don’t like working late into the night.

A. so                B. that             C. it                D. them

 ---Why not open the windows to let _____cool air in?

---I’d rather you didn’t. ________air in out town is terribly polluted.

A. a; The             B. /; The            C. / ;/                   D. the; /

 ----Are my clothes too casual?

----No. You can go ____you are.

A. as                B. what             C. that                  D. where

 How     ___  I help them to understand when they won’t listen to me?

A．can                        B．would                  C．may                         D．must

 In summer, food will go bad if________in room temperature.

    A．leaving                  B．left                        C．being left                 D．having left

 QQ,        you can chat with your friends, makes communication easy.

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