7．November is a month which has many ________(多雾的)days.
6．There are plans to widen the ________(最狭窄的)sections of the road.
5．Professor Smith is busy doing h________ research.
4．The 20kilometrelong subway is so far Guangzhou’s largest c________ project.
3．Many great people，such as Sun Yetsen and Mao Zedong，were once active in the south，leaving behind many historical s________.
2．They will do their best to g________ more energy from the wind and sun.
1．Burning coal has led to g________ warming.
5．They are too young to understand such things.
4．Make sure that you turn off the lights when you leave the room.
