9．Have you ever been to the Greenwich ________(天文台)?

8．When he was at university，he majored in ________(工程学)．

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.