We areimproving the state of the environment by reducing the level of CO2 we produced.
A. luckily
B. carefully
C. happily
D. gradually
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We moved to Londonwe could visit our friends more often.
A. even if
B. lest
C. so that
D. in case
You see the lighteningit happens, but you hear the thunder later.
A. the instant
B. for an instant
C. on an instant
D. in an instant
We'll visit England and Germany next yearwe have enough money.
A. unless
B. lest
C. provided
D. until
we go swimming every dayus a lot of good.
A. If ... do ...
B. If ... that ...
C. That ... do ...
D. That ... does ...
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