I'm not sure where my necklace is, but I have a pretty good idea who________it.
I, not you , _____ in the wrong. Not I but he _____been invited .
It is said that the iron and steel works _____not far from here, but now there ______no means of finding it out.
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.