Los Angeles Times reported that researchers may have found a way to ______ human life by changing certain genes, so that humans might expect to live twice as long.
He arrived at the station, ______that the bus_____ off .
Do you mind ____smoking here?
Jack doesn’t look ___ his father, but he walks ___ his father does.
—Do you like it? —Yes, nothing ___.
_______ of money were spent on the project.