品句填词There is an________(观察台)at the top of the Empire State Building.
The amount of paperwork involved is________(巨大的)．
It is difficult to travel through the town on a ________(有雾的)morning.
He studies in a college of________(工程学)．
He is engaged in________(历史学的)research.
There is a dbecause the bridge is broken.
If you are very quiet, you can hear dmusic from the circus in town.
__________（贸易）between the two countries has increased.
They put all their ginto a shopping cart and left the supermarket.
The sun was shining brightly as we sailed __________（顺流而下）through a hilly region.