—Everybody knows smoking is harmful to health,but still so many people smoke.—Exactly! So our country is planning to start a ________ against smoking.
In my opinion, mathematics _____fun, but more than 80% of the group _____agree with me.
Twenty years _____ passed since I came to this school, but I feel twenty years _____a short time in my life.
---- What do you know about the population of China? ---- It _____ over 1,200 million and 80 percent of it _____ peasants.
It will take _____ time to finish the project.
It is not rare in ____ that people in ____fifties are going to university for further education.