Our teacher has _________ some very difficult questions to ask us.
——What about the protection? ——Let us keep the surface dirt by putting a cover over it.
China is a large country, which 9,600,000 square kilometers.
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.