Hurry up!Jack for you to play basketball.
OK.I'm coming..( )
A.waitedB.is waiting
C.was waiting
I don't think students should use mobile phones at school.
______.They really have a bad influence on our study.( )
A.I agree with youB.Not at all
C.No problemD.It's my pleasure
Many scientists believe that robots ______ able to talk like humans in 50years.( )
A.wereB.areC.will beD.have been
Why does the earth look blue in space?
Because most of the earth's surface ______ by water.( )
A.coversB.is covered
C.coverD.are covered
Look! The model is walking to us.______ nice dress!( )
A.WhatB.What aC.HowD.How a
What were you doing ______ I knocked at the door?
I was sleeping.( )
A.unlessB.onceC.whenD.while