Students should be encouraged to use Internet as resource。
Dogs have a very good ______ of smell and are often used to search for survivors in an earthquake.
To save some of the human languages before they are forgotten, the students in our school started a discussion “Save Our ________”
In a time of social reform, people’s state of mind tends to keep _______ with the rapid changes of society.
Mr. Barren doesn’t think that all bad language should be allowed. In his opinion, there are ___________ that should be kept up.