It took a long time for the effective use of natural gas_________.
As we all know, newspapers, magazines and radios as well as television broadcasts can keep us about what is happening at home and abroad.
Mike is handsome, kind and full of energy. , I can’t speak too highly of him.
The purpose of their explorations is as important to them as to us.
Besides the others, there was still third one who said he was second to reach the end.
________ the classroom, the teacher found all the parents already______ there.