The 20th century________ many new means of communication，like radios, televisions, telephones and the Internet.

Mr.Smith        an imprtant part when he gave the lecture last Friday .

 So far, I haven’t adapted to the fast          of the life in Toronto.

The competition is fierce .No women or children are allowed to ________.

And you find that you're not to be _____ with a position of real responsibility.