-- _____is that used for?---_____ the floor.
How long did it take them to get ___ this river?A.through B,over C.across D.till
This is an illness that can result in total blindness ________ left untreated.
— We want someone to design the new art museum for us. — ________ the young fellow have a try?
The little boy is dirty from head to foot because he ________ in the mud all morning.
So many directors ________, the board meeting had to be put off.