Is Nancy doing her homework— . She is watching TV.

My book was here a second ago but now it’s missing. Someone _____ a joke on me.[ ]

made a commitment to the world in the Copenhagen Summit that by 2020, the carbon-intensity of its economy ______ fall 40% to 45%.

your treatment(招待), we really had a great time in Chongqing.

Neither of them thought______ of him and they both tried to _____ him in his work.