题目内容

He walked carefullyhe fall.

A. lest
B. unless
C. except
D. now that

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Some plastics areand that is bad for the environment.

A. of good quality
B. of high quality
C. new
D. non-degradable

A car that only usesenergy and not fossil energy like petrol is very environmentally friendly.

A. sole
B. solar
C. only
D. rare

We areimproving the state of the environment by reducing the level of CO2 we produced.

A. luckily
B. carefully
C. happily
D. gradually

We moved to Londonwe could visit our friends more often.

A. even if
B. lest
C. so that
D. in case