The students respect their head teacher，although she is strict，she is fair

Many people in China have never dreamed of ________ a chance for them to learn to drive aftertheir retirement[ ]

The 40-somethings found themselves in an embarrassing situation _____ rapid changes in all aspects of society

He warmly congratulated them on _____ they had achieved in science and technology

You are working too hard. You’d better keepa ________ between work and relaxation.