The car ran over a girl and her cat _____ were just crossing the road.
The two top students in Mr. Green’s class competed _____ each other for the highest marks.
Everyone has periods in their lives________ everything seems very hard.
—How about camping this weekend,just for a change? —OK,________you want.
In _________to being used in industry,laser can be applied to operations in the hospital.
Children under 18 will not be ____into the pub in this country.