Choose the best answer for the following sentences:
The boy tiptoed into the room _______ wake everybody up.
A.so as to
B.in order that
C.so as not to
D.not to

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

Do the particles react with nitric acid?
A.No, but they continue to absorb the sun’s energy.
B.No, and the particles do not change.
C.Yes, but the changes are temporary.
D.Yes, and the changes are permanent.

What is the main idea of the passage?
A.There is a new particle called calcium nitrate.
B.Factories are polluting the environment.
C.Climate models have to be updated because of the new particle calcium nitrate.
D.Calcium nitrate lias chemical properties different from other dust particles.

__________(9)
A.for
B.at
C.with
D.against

_________(7)
A.take
B.get
C.have
D.make

Choose the best answer to the following questions.
After Mariana _______ her exam, I _______ her out to eat.
A.was finishing / would take
B.finished / had taken
C.will finish / have taken
D.has finished / will take

Choose the best answer to the following questions.
_______, Joe stays in bed and reads magazines.
A.Whenever raining
B.As it will be raining
C.When it will rain
D.Whenever it rains

Choose the best answer to the following questions.
Jones _______ after everyone _______.
A.speaks / will eat
B.will speak / has eaten
C.is speaking / eats
D.has spoken / will have eaten

Choose the best answer to the following questions.
_______ my homework, I went to bed.
A.After I had finished
B.After finished
C.Finished
D.After had finished