39().

A．ended
B．over
C．completed
D．finished

Traveling can be fun and easy. A vacation trip to another country is especially (21) when the traveling conditions are good. Good traveling conditions (22) a comfortable mode of transportation, knowledge of the (23) language, familiarity (24) the custom and habits of the people in the country, and pleasant traveling (25) . All of us have had nice trips (26) this.

Most of us have also had trips that we would (27) to forget. Many conditions can produce a bad (28) experience. For example, if the four conditions (29) above do not exist, we will probably have a bad experience, (30) at best difficult (31) . Students who travel to a (32) country to study often have a difficult trip. They usually travel (33) . They don’t know the language of the new country (34) . They often arrive in the new country (35) a judge international airport. From the airport, they need to (36) their way to their school. Maybe they need to (37) airplanes, to take a bus, a train, or a taxi. They need to do ail this in a country (38) everything is unfamiliar. Later, after the experience is (39) , they can laugh. But at the (40) , they feel terrible.