Not until he met with the difficulty _______ the importance of group work.
Stop_____ this kind of deer. They are_________.
Great attention must be paid ________ education,especially in the countryside.
I have many friends, someare businessmen.
The driver who died in the accident could have ________, but he was sent to hospital too late.
The patient’s progress was very encouraging as he could ________ get out of bed without help.