The film star wears sunglasses. Therefore，he can go shopping without ______.
A. recognizing B. being recognized
C. having recognized D. having been recognized
Last night，there were millions of people ________ the opening ceremony live on TV.
A. watch B. to watch
C. watched D. watching
When we saw the road ________ with snow, we decided to spend the holiday at home.
A. block B. to block
C. blocking D. blocked
the course very difficult, she decided to move to a lower level.
A. Find B. Finding
C. To find D. Found
______ where to have a picnic for several days，the big family finally made a decision.
A. Discussed B. Discussing
C. To discuss D. Having discussed
_____in voluntary work makes him feel happy and fulfilled.
A. Participate B. Participated
C. Participating D. Having participated
