All of the following are factors in the development of the balloon- frame house EXCEPT______.
A.the invention of sophisticated tools
B.the falling price of lumber
C.the production of cheap nails
D.improvements in sawmills

According to the passage, why was the term balloon- frame applied to certain houses?
A.They were made of lightweight materials.
B.They had rounded frames that slightly resembled balloons.
C.They could be easily expanded.
D.They could be moved from place to place.

__________(1)
A.most
B.most of
C.almost
D.mostly

__________(3)
A.about
B.to
C.of
D.for

__________(5)
A.more
B.larger
C.easier
D.popular

__________(6)
A.make
B.have
C.do
D.ring

__________(8)
A.houseful
B.households
C.housewife
D.housework

__________(10)
A.raise
B.forecast
C.come
D.appear

Pick out the word that has the stress differently from that of the other words.

A.confident
B.interview
C.advertise
D.position

Pick out the word that has the stress differently from that of the other words.

A.productivity
B.economical
C.agricultural
D.administrative