We were suggested that we ____ attention to protecting wild animals.

Some aspects(方面) of a teacher’s job ______ be tiring, and teachers often ______ work at inconvenient hours.

Just imagine performing such an opera as Turandot in the Forbidden City there _____ be a better setting!

The police still haven’t found her, but they’re doing all they _____. 

My parents insisted that I _____ medicine instead of law.