---Where will you start your work after graduation?---Mmm, it's not been decided yet. I ____ continue my study for a higher degree.
The research is so designed that once _____ nothing can be done to change it.
If _____ carefully, the experiment will be successful.
----- When was the People’s Liberation Army’s Navy founded?-----It ____the April of 1949.
A naval parade can provide a platform, _____ navies on behalf of different nations can communicate.
It has been that some government leaders _____ their authority and position to get illegal profits for themselves that resulted in the opposition in Thailand..