When is it cheaper to make an international call？A．12a. m.B．6p. m.C．11p. m.

According to Charles, people send messages via facsimile because ______.A．it is cheaper an

One good way to master the ideas of an article is to make a（n)______ of it.A．abstractB．dig

When the suffix______is added to a verb, it changes this verb into an adjective.A．-lessB．-

Making your way gloomily to the airport after an action-packed holiday, it is easy to fee

It is not polite to ________ when someone is making a speech at a meeting like this.

It is very important to provide an environment ______ people are encouraged to make sugg