—________ one and a half months enough for the project to be finished?—I am afraid not. The professor is ill and only after he recovers ________ go on with it.

Only by increasing the number of doctors by 50 percent    properly in this hospital.

Have you got a free evening next week ? ________, let’s have dinner.

The research is so designed that, once _______, nothing can be done to change it.

Little ______ about his own safety, though he was in great danger himself.