–Where are the students? How could they keep us waiting for so long? –They started an hour ago and they ____ be here in fifteen minutes, I think.
While doubts about the medicine’s safety have____________, interest continues to grow.
Do you know in what circumstances was it____________ Jack achieved his goal?
If penicillin _____________ available, many people ______________ from sickness.
Another drug that has helped improve people’s health is penicillin, _________ is _________ by many _________ one of the most important medicines.
Not only _____________ vital for reducing fever, but __________ also other things that it can help with.