57 （）

It is very difficult to get from one place to another in Tokyo because __________.

• A、the city is so large and so high

• B、there is no traffic

• C、we don't know the road 

• D、the city is so large and the traffic is so heavy

When Williams began working on his book, he __________ .

• A、was paid $ 35,000 

• B、learned to paint

• C、had already buried the treasure

• D、did not know what the story would be about