A foreign visitor is coming to visit our new house this evening. My mother will offer him _______ to eat. 

What we need is a patient teacher, __________ who listens to us students.

Most of us found ______ difficult to finish the work in such a short time.

The price system is a complex network composed of the prices of all the products bought and sold in the economy as well as       of a great number of services. 

-----Can I ask you a few straightforward questions about yourself?------No problem. I like______ when people are open and direct.