The scientists have made an______study of the viruses that cause the disease.A.exhaustedB.

Scientists have been calculating the likelihood of a small planet to ______ with the Earth

One thousand______scientists have signed the declaration supporting responsible experiment

Scientists have spent years researching into the _____ of sleeping pills on the hum

______ the reactions of people with this drug scientists have learned more about the brai

With the populationexplosion scientists will have to_______new methods ofincreasing the wo

Scientists have spent years researching into the _____ of sleeping pills on the hum