I used to live in London.
A.I lived in London once, but I don't any more.
B.I was used to living in London a long time ago.
C.It's a long time since I left London.
D.No more do I want to live in London.

In the end of the party, Mary found herself washing the dishes alone again, as usual.
A.In
B.herself
C.washing
D.as usual

_________(41)
A.break-up
B.outburst
C.outbreak
D.breakout

_________(43)
A.also
B.too
C.either
D.as well

_________(44)
A.do
B.are
C.will
D.does

_________(46)
A.strict
B.severe
C.serious
D.heavy

_________(48)
A.direct
B.straight
C.immediate
D.square

_________(50)
A.circumstance
B.situation
C.case
D.form

Why do climate models need to be updated to reflect the chemistry of calcium nitrate?
A.The new particles can absorb water and retain moisture.
B.The new particles can scatter and absorb sunlight.
C.to stop acid dust
D.The new particles can absorb water, retain moisture , scatter and absorb sunlight.

Which of the following may be a result of these particles?
A.The chance of an ice age is increased.
B.We may see more rainbows.
C.The greenhouses effects are increased.
D.We may see an increase in carbon dioxide.