—Where is David?
—I think he________Australia．
A．has gone to
B．has been
C．has gone
D．has been to
—Have you packed the camera yet?
—Yes，of course．I________it last night．
A．have packed
B．was packed
C．packed
D．had packed
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
