I developed very slowly and it took nearly two hundred years        I was built as an analytical machine by Charles Babbage.

I was just at the school gate    the bell rang.

Scientists say it may be five years ______ it is possible to test this medicine on human patients．

__ You keep on coughing．What’s the matter? __ Oh, I’ve got a cold．Nothing serious,  ______?

All the parents in Mianyang admire Nanshan Middle School         the teachers are treating their students like friends.