in the course of _______, some birds have lost the power of flight.

due _______ staff shortages, we are unable to offer a full buffet service on this train.

the strong economy and availability of staff make the area a prime _______ for a business.

if blood loss during operation has been excessive, previously cross-matched blood will be _____.

i'm not in a position to ______ any of the details of the project at present.

we must _______ the simple fact that drugs are dangerous.

he is always ready to _______ heavy responsibilities.

to the ________ of my knowledge, the new project will be starting in june.

she is more than capable ________ passing the exam.

firms that fail to ________ advantage of the new technology will go out of business.

it will take many years to _____ existing cars that run on high octane leaded petrol.