Frank is a friend of ____.He is a scientist from Canada.
A. my B. I C. me D. mine
In order to protect the environment, all the countries should work ________ with each other.
A.close B.closely C.quiet D.quietly
My parents don’t allow me_______TV on school nights.
A. to watch B. watch C. watches D. watching
Mary, turn off the water ________ you are brushing your teeth.
A.until B.unless C.while D.before
Those young firemen were brave enough to __________ the fire in the forest.
A. work out B. put out C. hand out D. look out
My mother ________ the floor when I did my homework last night.
A.is sweeping B.was sweeping C.sweeping D.has swept
