Cable TV began in 1948 in the USA, but it took 50 years ________ 66 percent of American households had it

We should never ____till tomorrowwhat we can do today.

Please don’t talk with others in class, —Sorry, .

I am going ______ at home. I don’t want to see a film.

It’s dangerous to swim in this river.—Yes, you are right. The government has ___ people not to swim in it.