The reason ___ he didn’t attend the meeting yesterday was ___ his child had fallen ill.
| A．that, why | B．why, that | C．why, why | D．that, that |
The research is so designed that once _____ nothing can be done to change it.
| A．begins | B．having begun | C．beginning | D．begun |
If _____ carefully, the experiment will be successful.
| A．do | B．does | C．done | D．doing |
----- When was the People’s Liberation Army’s Navy founded?
-----It ____the April of 1949.
| A．dates to | B．dated back | C．dated from | D．dates back to |
A naval parade can provide a platform, _____ navies on behalf of different nations can communicate.
| A．in which | B．through which | C．where | D．that |
It has been that some government leaders _____ their authority and position to get illegal profits for themselves that resulted in the opposition in Thailand..
| A．abuse | B．take | C．employ | D．overlook |