There are _____ living things on the earth， we must care for our home --- the earth.
A. million B. millions C. million of D. millions of
There are more than 5000 students in our middle school.
A. many B. much more C. over D. much
Trees are very important to our environment. They can stop wind from blowing the earth away.
A. kept B. put C. take D. prevent
—Hi， have you found your lost watch?
—Not yet， I have looked for it everywhere， but I still haven’t found it.
A. at those places B. here and there
C. somewhere D. over there
.Every teacher is supposed to be honored(诚实).
A. think B. allow C. should D. may
As we know， none of us likes pollution.
A. no one B. not everyone C. someone D. nothing
