根据要求进行句型转换，每空一词。（本题有10空格, 每空0.5分，共5分）
It takes about half an hour to reach Beijing by plane. (对划线部分提问 )
　　　 does it 　　to reach Beijing by plane?
I believe they are visiting us this Sunday．( 改为否定句 )
　 　   I 　　 believe they 　 visiting us this Sunday．
--Can you go to the mall with me this week? ( 作肯定回答 )
---Sure，　　　　　　 ．
It took me two hours to finish the project yesterday.( 改同义句)
I 　　 two hours 　　 the project yesterday.