—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 |