Mr.Liu waiting here for about five minutes.( )
has been
has come
came
arrived
I think our teacher.Mrs.Allen,knows everything.
I agree.Because she over 2,000 books.( )
A.readB.has readC.readsD.is reading
The 17﹣year﹣old high school student is trying to a robot which can think like a human.( )
A.discoverB.organizeC.inventD.achieve
Bill,does your sister have brown hair or red hair?
.She takes after my mother.( )
A.Yes,she doesB.No,she doesn't
C.Brown hairD.I don't know
If you are late for a moive,please walk in .( )
A.loudlyB.clearlyC.quietlyD.cheaply
Sun Hai his mother make dinner when his father got home from work.( )
A.was helpingB.helps
C.helpedD.is helping