China’s first self-designed modem bridge reopened to road traffic, we Chinese were so proud when it was built 50 years ago.

David didn’t give up _________ he had failed in the experiment four times.

all the required papers, he didn’tanswer the questions fluently in class．

Little Bob is often educated by his parentsto be good and friendly to anybody even if ________.

The train ______ Beijing is going to setoff.