We can never expect____ bluer sky unless we create_____less polluted world.（）
| A． | a; a | B． | a; the |
| C． | the; a | D． | the; the |
Qingdao is_______ most beautiful coastal city and I think I’ll go there for ________second time.
| A．a; a | B．a; the | C．the; the | D．the; a |
Marco found the walls of the Summer Palace were covered______gold and silver and the Hall was so large it could easily______6,000 people for dinner.
| A．with,seated | B．in,seated | C．in,seat | D．with,be seated |
_____the wind and waves we were going in the direction of the whirlpool,and nothing could save us.
| A．By | B．At | C．To | D．With |
Leif followed Biarn’s directions and sailed to _______is believed to be the coast of present-day Canada.
| A．which | B．what | C．where | D．that |
By around 900 AD,there were many places in Northern Europe______the Vikings chose to live.
| A．in which | B．when | C．which | D．at which |