It is 4:30 pm. Ben and Leon _______ their work, so they are playing chess now.( )
A.finishB.finished
C.have finishedD.will finish
Ben, is physics your favorite subject?
Yes, and it is important one.( )
A.aB.theC.an
Have you heard about the TV program Reader is very popular now?( )
A.whichB.whoC.where
Frank will fall behind in studies he works hard from now on.( )
A.unlessB.becauseC.if
Could you tell me by Wechat?( )
A.what can we doB.what we can do
C.what do we do
David, make trouble at school. ( )
A.can'tB.don'tC.doesn't