—Are you free now?
—No．I have so many chores________today．
A．do
B．to do
C．doing
D．done
—Most paper is made________wood．
—Yeah．But most books are made________paper．
A．of；of
B．from；from
C．of；from
D．from；of
Many overseas Chinese look forward to________more about their roots in the summer camp．
A．learn
B．be learning
C．learning
D．be learned
—Where did you get these old doors?
—From the old houses which were________by the workers．
A．taken down
B．pulled down
C．turned down
D．put down
Things should________here before you enter the Great Museum．
A．keeps
B．keep
C．be kept
D．are kept
—There are only a few old city walls left．
—Yeah．Most of them________in the 1960s．
A．pulled down
B．have pulled down
C．had pulled down
D．were pulled down
