. In September 2008 , China’s key milestone in space travel_____when Zhai Zhigang conducted the first space walk.
Whatever he explained, he couldn't ______ the policeman that he was innocent.
It ______ ,for there is no one that can be relied on.
The final examination is coming up soon. It's time for us to ______ our studies.
The local people ______ building the new hotel because of the great cost.
_____________________,tomorrow, our ship will set sail for Macao.