It's ______ to find food now in Zhalong than before．

　　A.easy　　B．much easier　　C. difficult　　D. not so easy

The scientists are studying the changes _________ their number．

　　A．about　　B．of

　　C．in　　D．on

Those people don't have _________ to live in．

　　A．space enough　　B．enough spaces

　　C．spaces enough　　D．enough space

We must prevent the dog from _________ people．

　　A．to bite　　B．bit

　　C．biting　　D．bited

We add "es" _________ the word "box" and get "boxes"．

　　A．to　　B．in

　　C．between　　D．on

That is a good place _________ the dog

　　A．walks　　B．walk

　　C．for walk　　D．to walk

They want to find out _________ they know about Zhalong．

　　A．how many　　B．how often

　　C．how much　　D．how long

They are talking about the trip _________ Beijing now．

　　A．about　　B．at

　　C．to　　D．on

Tom isn't _________ next week because he is too busy．

　　A．go camping　　B．going camping

　　C．goes camp　　D．going camp

The zookeeper told us about ______ different birds．

　　A．both　　B．the all

　　C.all the　　D．all