Mr Li who is in _____ charge of our class is very experienced.
A．the B．a C．/ D．an
He is a man of ____ and he had a lot of interesting ____ in his life.
A．much experience, experiences B．many experiences, experience
C．much experience, experience D．many experiences, experiences
I don’t think _____ possible to master a foreign language without much memory work and practice.
A．this B．that C．it D．/
Work hard at your lessons, ______ you’ll fail the exams again.
A．and B．but C．or D．which
He devoted all the time _____ his research .
A．to do B．doing C．to doing D．did
Mr. Liu dreamed ____ a big house for his parents after they retire.
A．to buy B．to buying C．of buying D．of being buying
