As far as I know, the robot that can sweep the floor ________ in the 1980s.( )
is invented
invented
was invented
has invented
How is our government going to deal with the office building?
It will be _____ a library.( )
A.turned offB.turned on
C.turned outD.turned into
______ fine weather it is! Shall we go hiking in the hills?
Why not?( )
A.WhatB.What aC.HowD.How a
It's reported that self﹣driving cars are expected to change the way we move around.
That sounds __________.( )
A.badB.badlyC.greatD.greatly
The manager of the hotel was waiting at the gate _______ the guests arrived.( )
A.whileB.whenC.unlessD.after
Liu Changjian,the command pilot of Sichuan Airlines Flight 3U8633, successfully _______ down the plane last month.( )
A.has broughtB.will bring
C.broughtD.bring