In fact, more and more people ____ to live a greener, healthier and more environmentally “green life”.
The teacher ___________his students to work hard.
After the age of 50 people often _____________ their individual ambitions.
He is a key ____________ in the murder so we must protect him from all kinds of danger.
Russia is _________ on the north of China.
Lately some scientists are experimenting ___________ white mice to ____________ this kind of medicine.