It is not profitable to provide bus services in districts where the population is widely _____.
In my opinion, all Mr Li ______ good to his students in his class at present. He is very strict with them in their studies.
In a(n) _____ to help preserve history, the Greek government established a committee to undertake the professional restoration of the Acropolis.
Lawrence Craven, a doctor from the USA, is the author of several published reports, one of ________ introduced the idea in 1953 _________ aspirin could reduce the risk of heart attacks.
In the new curriculum, some courses are , while others are optional for middle school students.
—How do you find the health club?—I it. Everyone is saying its management is going from bad to worse.