6. This paint is meant to be used on the  of houses.
    a. external  b. outsiders    c. exteriors   d. outer

 7. Mr. Hashi took his car to the mechanic to have it .
    a. referred   b. renewed   c. repaired    d. reformed

 8. London's Heathrow Airport is  airports in the world.
    a. the one busiest of  b. one of the busiest   c. the busiest ne of   d. of the buiest one

 9. William has been busy ever  he got to work this week.
    a. since    b. until    c. from    d. to

10. Unemployment has dipped to its lowest  in several years.
    a. stage   b. measure   c. step     d. level

解答

 6. This paint is meant to be used on the (c) of houses.
    a. external  b. outsiders    c. exteriors   d. outer

    内装はinterior, 外装は exterior
    
 7. Mr. Hashi took his car to the mechanic to have it (c).
    a. referred   b. renewed   c. repaired    d. reformed

    家などは reform するといいますが、車は repair ですね。

 8. London's heathrow Airport is (b) airports in the world.
    a. the one busiest of  b. one of the busiest   c. the busiest ne of   d. of the buiest one

　　one of the + 最上級


 9. William has been busy ever (a) he got to work this week.
    a. since    b. until    c. from    d. to

    ever since で 「〜以来ずっと」というイディオム

10. Unemployment has dipped to its lowest (d) in several years.
    a. stage   b. measure   c. step     d. level

　　（最も低い）水準（レベル）