Whose pen is this — Oh, it’s_____. I was looking for it everywhere.

Exploring ________ space is exciting, yet dangerous.There is _______need for both robots and humans for space exploration.

The fire started on the tenth floor and spread through the building very quickly before most residents above _______ escape.[ ]

life in a new country can bedifficult, it can broadcast a person’s view of the world

He had to take the medicine three times a day, so as to be _____ pain in the leg.[ ]