Chen Xiexia is the first Chinese athlete ______ the gold medal in the Beijing Olympic Games.

. Peter received a letter just now __________ his grandma would come to see him soon. 

—Please go on with your demonstration．—But where was I?—Well, you_____the two chemicals together．

Nankai University,_______ in 1919, has a history of more than 94 years.    (     )

It is no use       without taking any measures.