Many graduates in China do their best to go abroad to seek their______.

It’s reported that workers on London’s underground train network will go on strike（罢工）in ________ with colleagues losing their jobs at ticket offices. 

You've missed your ____， and you will have to wait for the next round. 

．Hundreds of people gave their lives in __________ of freedom.

AIDS control and prevention is a   to China as well as the whole world．