---How can we reduce CO2 in our home? ---It’s easy.______off your TV or computers when you’re not using them, and you’ll greatly reduce it.
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.
People drank a kind of tea _________ from leaves _________ a special chemical to reduce body pains and fever.