1.______ more attention, the trees could have grown better.

  A. To give       B. Having given       C. Given      D. Giving

2. The first textbooks ______ for teaching English as a foreign language came out 

  in the 16th century.

  A. to be written       B. written        C. being written       D. having written

3. The missing boys were last seen ______ near the river.

  A. to play          B. play         C. to be playing         D. playing

4.______ in thought, he almost ran into the car in front of him.

  A. To lose          B. Lost         C. Having lost         D. Losing

5. When passing me he pretended ______ me.

  A. to see     B. not having seen      C. to have not seen      D. not to have seen

6. The children insisted ______ there on foot.

  A. they going       B. they would go     C. on their going   D. going

7. He still remembers ______ to Shanghai when he was very young.

  A. taking           B. being taken       C. taken            D. having taken

8.______ the railway station, we had a break, only ______ the train had left.

  A. Arriving at; to find                  B. Coming to; discovering that