The door bell is ringing, please go and see _______.( )
A.who is itB.who it isC.who was itD.who it was
It took us half___________ hour to read Little Women.( )
A.aB.anC.the
My mother ________ in the kitchen when the rainstorm came.( )
A.was cookingB.is cooking
C.cooks
A 3﹣kilometer﹣long bridge ________ in our hometown three years ago.( )
A.has builtB.is builtC.was built
Diana used to _________ to work, but now she is used to ________ because the road is crowded and she wants to keep fit.( )
A.drive; walkB.drive; walking
C.driving; walk
I found ________difficult for me to finish the work on time.( )
A.thatB.itC.this