Hummock grasses grow in loose sand on the crest.
A.side
B.bottom
C.top
D.inside

A.roughly
B.tough
C.enough
D.though

A.area
B.arise
C.arrange
D.arrive

A.circle
B.center
C.census
D.cancel

__________(49)
A.onto
B.up to
C.to
D.into

__________(46)
A.is proving
B.has proved
C.proved
D.had proved

__________(44)
A.artificial
B.synthetic
C.compound
D.man-made

Choose the best answer A, B, C or D to complete sentences.
She likes to study................ at university.
A.economy
B.economic
C.economics
D.economical

Choose the best answer A, B, C or D to complete sentences.
The actress was very............. dressed in an outfit.
A.expense
B.expensive
C.inexpensive
D.expensively

Choose the best answer A, B, C or D to complete sentences.
I thought the painting was worth a lot of money, but it turned out to be comepletely............. .
A.value
B.valuable
C.invaluable
D.valueless