The extra room _______ very useful when we had visitors.

While little Tony was climbing up a tree he fell off,        his leg.

The government has taken measures to ____ the high prices of daily goods to keep the market stable.

When argument ________ in a relationship between two people, a usual way of dealing with this is to send messages through a third person.

A teacher who is just interested in his teaching but doesn’t _____ students is not a good teacher.