Ⅰ.单项填空
1. ______ into the classroom，he saw Ruth standing alone in the corner.
A. Go B. To go
C. Going D. Gone
2. Don't ______ what the man says. Work hard and ______ yourself, and you'll succeed one day.
A. believe in; believe in
B. believe; believe
C. believe; believe in
D. believe in; believe
3. — What happened to your best friend?
— He slipped on the icy road ______ after a bus，and had his leg broken.
A. to chase B. having chased
C. chased D. chasing
4. Mr. Smith was found in a remote village after ______ his office last Thursday.
