In these years, the shortages of water has become a ______ problem.

The ______ scene where the accident happened made him ______ to death.

Though____ with housework all day long, Julia managed to spare some time to learn Chinese

Scientists are increasely _____ that the earth is getting hotter because of carbon dioxide and other gases.

So far we have done a lot to build a low—carbon economy, but it is ____ideal. We have to work still harder.