Studies show that people are more __________ to suffer from back problems if they always sit before computer screens for long hours.

The Chinese Educational Department suggests teachers should receive ________ education to catch up with the ________ development.[ ]

I always look _____ those who never look _____ others, even though they have achieved great achievements

The policemen his name and address.

The bell______ the end of the period rang, ______ oue heated discussion.[ ]