Strict security measures are in force in the capital city.
A. protection
B. guard
C. politics
D. safety
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Please remember to keep the medicine in a sealed container.
A. safe
B. tight-closed
C. qualified
D. mysterious
The plant provides forty percent of the country's electricity.
A. factory
B. farm
C. station
D. dam
He insisted that she put forward the proposal at a proper time.
A. adequate
B. suitable
C. considerable
D. exact
Nevertheless, many people lack enviromental awareness.
A. Therefore
But
C. Instead
D. However