That was so serious a matter that I had no choice but ________ the police.a. to call in b. call in c. calling in d. called in
The majority remained in ______ we now know as California to make a life.
_____is compulsory by law for a citizen to undertake military service.
She brought with her three friends, none of _____ I had ever met before.
The idea of cloning extinct dinosaurs _____ a mixture of fear and excitement into people’s hearts, as evidenced by the popularity of Jurassic Park.
If there is _____ emergency, they have to travel three hours to get to ____ nearest hospital for help.