The great advantage of using audio magazines is that they ……(27)…… you to perfect your language skills in ways that suit your lifestyle. For example, you can select a topic and listen in your car or hotel when away on business. No other business course is as ……(28)…… And the unique radio-magazine format is as instructive as it is entertaining. In addition to the audiocassette, this package includes a transcript with a business glossary and a study ……(29)…… The components are structured so that intermediate and advanced students may use them separately or together ……(30)…… on their ability.

　　Example: A B C D

　　20 A gain B result C success D outcome

　　21 A exercise B performance C practice D operation

　　22 A self B individual C personal D own

　　23 A after B then C later D quicker

　　24 A consists B includes C contains D involves

　　25 A insisted B acquired C asserted D assumed

　　26 A prolong B extend C spread D lift

　　27 A allow B let C support D offer

　　28 A adjustable B flexible C convertible D variable

　　29 A addition B supplement C extra D manuscript

　　30 A according B depending C relating D basing