With the change of the economic foundation the entire immense superstructure is _____ rapidly transformed.
—Mary, the telephone is ringing!—______, but I am washing my hair.
“I________in the room, watching TV broadcast about the earthquake.” I told the policeman who had driven here to question me.
Write down the key words that you __________ your students to find in the passage.
________in charge of the shopping center has upset him for quite some time.
The computer looks old, but it _________ just half a year ago.