After ________________ a sandstorm warning on Sunday evening, meteorologists forecast that dusty weather will continue in parts of the country on Monday.
He told me the news_____, believe it or not, he had earned $1 000 in a single day.
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.