v.
He could not keep up and dropped out of the race
We sustained the diplomatic negotiations as long as possible
prolong the treatment of the patient
keep up the good work
We preserve these archeological findings
The old lady could not keep up the building
children must be taught to conserve our national heritage
The museum curator conserved the ancient manuscripts
He kept up on his country's foreign policies
The anticipation of the trip kept the children up all night
I kept myself up all night studying for the exam