As a result of __ is now known in physics and chemistry, scientists have been able to make important discoveries in biology and medicine.
When the middle-aged man was visiting his girlfriend, she demanded that he _______ his beard.
— What on earth did the manager want to know? — ____ that we could finish the project.
The famous reporter, who is said to have gone back to America last year, _____in China for almost twenty years.
The time and effort he has devoted during the past few years____ trees in that remote area is now considered to be of great value.
After five hours’ drive, they reached ____ they thought was the place they had been dreaming of.