6. – ________ do you fly to New York on business?

　　– Nearly once every two months.

　　A) How fast            B) How often            C) How long          D) How soon

　　7. — _______ are you leaving for the airport?

　　— In about half an hour.

　　A) How soon    B) How often    C) How far     D) How long

　　8. A: ________ does this pair of new Nike shoes belong to?

　　B: It must be Jeff’s. It’s his birthday present from his dad.

　　A) What                   B) Who               C) Which            D) Whose

　　9.    ______ can you hold your breath when you are swimming?

　　A) How long    B) How soon    C) How far    D) How fast

　　10. – _______ has Line 22 (From Jinshanwei Station to Shanghai South Railway Station) been open to traffic?

　　– Since 2012.

　　A) How far    B) How soon    C) How long    D) How much