-- _____is that used for?---_____ the floor.
The Forbidden City is a great tourist _____ drawing millions of visitors every year.
The reason ____ you failed, I suppose, was ____ you didn’t follow your teacher’s advice.
Don’t let yourself ______ into buying things you don’t really want.
—Is this the magazine ______ she often writes articles?—Yes, it is.
“This is ______ most useful reference book, ” Mr. Lee told us in ______ class.