Polly observed that she ______ by a tall man in a dark coat when she ______ the faces around her on the train.

He observed a stranger________into the building，but he didn’t see clearly who he was.

A．to go B．go

C．enter D．entering

Polly observed that she ______ by a tall man in a dark coat when she ______ the faces around her on the train

1. A.
   was watched; stared at
2. B.
   was being watched; glanced at
3. C.
   was being watched; glared at
4. D.
   was watched; looked at

He observed a stranger _______ around the store at 12 p.m. last night.

1. A.
   to hang
2. B.
   hang
3. C.
   hanging
4. D.
   to be hanging

She observed a man ________ on the opposite side of the way, and recognized it was Charlie

1. A.
   walked
2. B.
   walking
3. C.
   to walk
4. D.
   walks