Don’t waste your words any more; she is as ______ as a mule (骡子) and no one can persuade her.
The little boy was in danger. The doctors and nurses are doing him.
_______ the end of last term, we had learned 3,000 English words.
Through the satellites, we can send and _______ messages.
All is needed is a Supply of oil.
--When _________ the training course begin? --Next Monday.