I heard ______ shout to me from theroadside.

My Biology teacher often us about the latest news of Ebola(埃博拉) .—We also learn a lot about it and we are a little worried.

I think Mr. Zhang may be in his office.— No, he _____ be there. I saw him ____ therejust now.

For a long time they walked without saying__word, Jim was the first to break ___ silence.

I told you that you shouldn’t waste your time playing the computer games,_____________?