________ by keeping down costs will Power Data hold its advantage over other companies.
Was __ at the air battle on June 8,1994, ____ was led by Captain Johnson ___ Peter lost his life?
—I can’t find Mr. Smith. Where did you meet him this morning? —It was in the hall ____ our products were showed..
. It _____ Mary and Tom that often helped me at school.
I wonder ____ you were doing last night.
It musk be he that has stolen Mr. Smith’s purse. __________?