Scientists are trying to develop a special material, _______ they will make use of in space.
. She is writing a letter to a friend of hers, ___________ him to attend the meeting.
. Our town has dozens of factories, ___________ several saw mills.
. ___________ the classroom, the students went to the playground to watch the football match
1. I’ve heard him ______ about you often.2.
. I went to see him, _______ him out.