Many firms give away small quantities of their productions as _______ so that people can try them before buying.

The visiting European architects showed great ______ for the ancient Chinese building designs in the Forbidden City.

_____ the different cultures, values and levels of economic development in China and the West, both sides should respect the diversity of their development paths.

—Mr．Anderson is popular with his students, for he is kind, strict and knowledgeable． —No wonder he has such a good ___  ．

Before he started work, I asked the builder to give me a(n)_______ of the cost of repairing the roof.