"Mary, turn off the water_________you are brushing your teeth. " "Sorry, I'll do it at once. "A. until B. while C. during
--Is this a __________? --No.It’s a clock.
--Is this __________card? --Yes. ___________card is Tom’s.
Frank is my pen pal, he _____________ Sydney, Australia.
Tigers like to eat _____________, but koalas like to eat____________.
The pay phone is _____Green Street and it’s across ______ the library.