What are three main types of educational institutions?
A.Primary schools, secondary schools and universities
B.kinder garten, primary schools, secondary schools
C.Primary schools, secondary schools and vocational school
D.Primary schools, secondary schools and college

________(9)
A.would be
B.be
C.was
D.them

________(7)
A.every
B.ones
C.each
D.by

________(6)
A.off
B.with
C.on
D.in

_______(46)
A.extinction
B.extinct
C.exist
D.existence

_______(48)
A.to drain
B.drainage
C.drain
D.draining

______(49)
A.survive
B.save
C.reduce
D.increase

_______(50)
A.remote
B.isolated
C.wilderness
D.desert

A.flame
B.hate
C.page
D.adventure

A.helped
B.liked
C.watched
D.hated