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Great efforts        grain production must be made if food shortages are to be avoided.

       A．to have increased            B．increased

       C．to increase              D．to be increased

Rio De Janeiro,        the right to host the 2016 Olympic Games, will be occupied in building stadiums.

       A．winning    B．won  C．having won      D．to win

_____  with a difficult situation, Arnold decided to ask his boss for advice.

A. Faced         B. To face            C. Having faced    D. Facing

Personal relationships ______ over years may be lost when we move houses.

A. building up              B. built up          C. having built up     D. to be built up

Partly ______ about his lost love, he buried himself in office work.

A. forgetting        B. to have forgot           C. to forget            D. having forgot

Jean did not have time to go to the concert last night because she was busy ______ for her examination.

A. to prepare　                  B. to be prepared
C. preparing　　　               D. being prepared

Whenever he was asked why he was late for class, he would answer carefully, always          the same thing.
A. saying                        B. said                      C. to say               D. having said

---Cathy seems to be very happy.

   ---Surely she is. Having passed all the tests, she felt a great weight        off her mind.

       A．taking      B．taken C．take   D．to be taken

Schools across China are expected to hire 50,000 college graduates this year as short-term teachers        increase job opportunities.

       A．help  B．to have helped  C．to help      D．having helped

Police were sent out to keep the traffic ________ smoothly during the snowstorm.