Open the brackets using the Infinitive or Participle I.

1. He was silent, staring at her, and she could almost hear his mind (work). 2. Clare found herself (giggle) with him out of sheer nervousness. 3. When they saw me (come), they sprang apart. 4.1 failed to see the guests (leave). 5. I looked out of the window and saw the rain (pour) down on the leafless garden. 6. They heard a key (turn) in a lock and then, suddenly, a light appeared in a light corner; a trap-door was being opened, letting in the light. They could see a strong hand (push) it up, and Dick raised his crossbow, waiting for somebody (appear).

7. After an hour's rest I felt the tensions of the workday (disappear). 8. She glanced back and saw the stranger (follow) her slowly. 9. I saw the cup (slip) from her hand and (fall) to the floor. 10. We felt it (come) for a long time. 11. Helen returned to the hostel from the University to find her roommates (have) a surprise party. 12. The police saw the agent (stop) and (take) a few shots. 13. The parents watched their kids (laugh, talk and enjoy) themselves on the green lawn. 14.1 saw the unhappy young man (sit) with a miserable expression. 15. We noticed him (give) a start and (turn) pale. 16.1 felt as if I could feel her heart (beat). And then, all of a sudden, I heard her heart (stop) (beat). 17.1 walked happily through the streets (watch) the town come to life.