Homo erectus pekinensis(北京人)________in Zhoukoudian Village，on the Longgu Mountain，Fangshan District，Beijing．
A．has discovered
B．was discovered
C．is discovered
D．will discover
Grandma________us stories when we were very young．
A．used to tell
B．was used to tell
C．is used to tell
D．was used to telling
—________free education，the poor children in my hometown can go back to school．
—So can the children in my hometown．
A．Thanks to
B．Instead of
C．As for
D．Towards
—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
