_________ has been proved in study that seat belts save lives.
The virus Ebola is reported ______ over 3,000 lives in 5 countries of West Africa by now.
It is generally believed that communication skills are becoming ______ it takes to be a good doctor.
_____, everyone present was amused by his adventure story in Africa.
The children's excitement______as Christmas drew near.
The first time I ____ Todd, he ____ to some students at the English corner.