-- _____is that used for?---_____ the floor.
I think she would _____ it if we could all help out a bit more.
—Sorry, sir, your car isn’t ready yet. It _____ in the garage.―That’s all right.
Special attention should be _____ to air pollution wherever the factory will be built.
In our class,when the bell rang and the teacher closed his book ,it was a ________for everyone to stand up .
He is so busy with the research _____ he has no time left for any other activity.