I knocked on the door several times but _______________ answered, so I left. 

They paid fifty percent of _____ they were able to earn to the state．

I would appreciate         if you could look after my pet while I am away.

___ of the students in my class can arrive on time because of the sudden heavy rain .

China’s first manned spaceship “Shenzhou Ⅴ” was sent up into space on October 15 and returned safely to the earth on October 16,______ is a great honour for our great motherland.