24. I do not want to be disturbed, so do not call me _______ it is something very important. 
A. when B. if C. unless D. although

25. When I arrived, Tom (lie) on the sofa and (speak) over the phone.
A. lied, spoke B. was liing, speaking  C. was liing, was speaking D. was lying, was speaking

26. I can not believe that the burglars _______ the house in the broad daylight.
A. Broke down B. Broke in C. Broke up D. Broke off

27. During my first few weeks at _______ I missed my parents a lot.
A. class B. boarding school C. curriculum D. graduate