Dr Yuan makes______ possible______ one-third more of the crop in the same fields.

       A．it; produce              B．it; producing

C. it; to produce             D. it; produced

 The fruit ________ fresh in his fruit stand sells well.

    A．looking   B．looked  C．looks  D．to be looked

 Where was it ______ you _______ our maths teacher?

   A. where; came to              B. that; come across,

 C. that; came across         D. where; come to

 ----- Mary looks very upset. She _______ failed to pass the exam.

   ----- I guess so. It's very difficult after all.

    A must have   B could have   C should have  D might have

  — When could you have a meal with me?
     — I'd like to go _______ it is convenient to you.     

    A. whichever B. whenever    C. whatever   D. wherever

  — Who are you going to have _______ this letter for you?

    — My secretary.

    A. type    B. typed     C. been typed    D. been typing

Not others but Mother always _____ children ______ in their beautiful clothes.

A. keep; dressed       B. kept; dressing

    C. keeps; dressing     D. keeps; dressed

 The West Lake we visited last year was really_____ attraction and

   we'd like to visit it _______ second time next year.

    A. \; a       B. the; the       C. an; a      D. \; the

 He ________ in American for five years, and now he works in Shanghai.

A. have worked  B. worked  C. had worked  D. have been working

Mary was born in 1752 in a rich family in _____ is now the state

   of Virginia.

   A. which    B. where      C. that        D. what