DIRECTIONS: Chооse the cоrrect word to complete eаch sentence. One word is extrа. compаct pioneer utility appliances threshold obstacle commonplace mode audit commute At the turn of the 21st century, cell phones became [BLANK-1]. Physicists think that experiments from the Large Hadron Collider are on the [BLANK-2] of discovering how particles really work. [BLANK-3] bills include gas, electric, water and telephone bills. The tax officials will [BLANK-4] your returns if something suggests that there’s a problem. Typical household [BLANK-5] include washing machines and refrigerators. [BLANK-6] cars are much smaller than buses. Roger’s daily [BLANK-7] takes two hours each way between his home and workplace. If you have to run a/an [BLANK-8] course, there are things in the way of your path. Mary Ellen Avery was a/an [BLANK-9] who revolutionized infant care in the 1950s.