I shall never forget the day _________Shen Zhou V was launched,_________has a great effect on my life.

 As ________ , they were waiting for us at the airport.

Smoking, _______ is a bad habit, is, however, popular. 

There was no sign _______ they had died from diseases such as bird flu - the main worry in such cases. Among the theories was _______ a truck had collided（碰撞）with the crowd.  

He had a lot of friends, none of _____ could lend him any money.