-Though radio and television are ____ popular in the world today, I think the TV is ____ useful.--Of course, on TV we can see and hear what is going on home and abroad.
_____ your sister _____ playing the piano these days?
The news I am going to tell you _____ very surprising.
I don’t know _____ tomorrow. Can you tell me?
My father didn’t go to bed ______ he washed his car last night.
We can’t do two things _____.