Laura, someone is ringing the doorbell. Go and see________, please.( )
A.who is heB.who it isC.who is it
Grandmother lives with my parents. They _____ her every day.( )
A.look atB.look afterC.look for
I _____ some washing when you called me last night.( )
A.was doingB.am doingC.were doing
Dad, I want to be a policeman in the future.
Work hard, _____ you will succeed.( )
A.orB.andC.but
_____ the mountain is, _____ the air is.( )
A.The highest, the thinnest
B.Higher, thinner
C.The higher, the thinner
It _____ me two hours to help Mary with her math last Saturday.( )
A.tookB.spentC.paid