Scientists say it may be five or ten years___________ it is possible to test this medicine on human patients

We haven’t settled the problem of ________ it is necessary for him to study abroad

We are bound to solve the present severe problem, ________ we act intelligently and promptly.

Who would you like to ____ to the cinemawith you this evening— No one. I would rather stay home thisevening.

Excuse me, could you tell me ______________________— In ten minutes.