C. to learning    D. could learn
4. (1) You can not imagine what a silly mistake I ______.
   A. make  B. made  C. have made  D. hade made
   (2) You can never imagine what great difficulty I have ______ your house.
A. found     B. finding       C. to find        D. for finding
5. (1) The person we spoke to _______ no answer at first.
   (2) The person was made _____ a speech at the meeting.
A. making      B. makes         C. to make          D. made
6. (1) He seemed _____ everything, but in fact he knew nothing.
    A. to know  B. to have known  C. to knowing  C. knowing
   (2) The person we referred to ______ us a report tomorrow.
A. giving      B. have given   C. gave     D. give
7. (1) The days we have been looking forward to ______ soon.
   (2) They have been looking forward to _____ to China soon.
   (3) These days we have been looking forward to _______ to visit you.
A. coming    B. will come     C. came       D. have come
8. (1) Are you talking about _____ the new school next week?
   (2) The person we talked about _______ our school last week.
A. visiting     B. will visit    C. visited      D. has visited
9. (1) The man is fond of _____ the most popular songs in our city.