-- _____is that used for?---_____ the floor.
—What are you going to do this weekend?一 . If time permits, I may go to Shanghai with my friends.
The officer insisted that Michael did not follow the correct ________ in applying for a visa.
It is important to have your eyes examined regularly to check for any sign of eye disease that may not have any ________.
Whether the buildings in this area should be pulled down has remained ________; people are still looking for other possible solutions.
Can you tell thedifference between the words "require" and "request"? I sometimes get puzzled by their meanings.