China recently tightened its waters controls near the Huangyan Island to prevent Chinese fishing boats fromin the South China Sea.
| A． | attacking | B． | having attacked | C． | being attacked | D． | having been attacked |
4. It used to ______ that humans and animals were different and had little in common.
| A．believing | B．be believed | C．believe | D．Believed |
5. The day breaks, _______ the birds are singing.
| A．for | B．because | C．since | D．As soon as |
6. _________, I attended the meeting instead of him last week.
| A．He was ill | B．His being ill | C．He being ill | D．Him being ill |
7. When you read the book, you’d better make a mark ______ you have questions.
| A．at which | B．at where | C．the place where | D．Where |
8. I didn’t see your sister at the cinema. If she ______, she would have met my brother.
| A．has come | B．did come | C．came | D．had come |