Rewrite the following sentences as required (根据所给要求，改写下列句子。每空格限填一词)
David left Shanghai for London to further his study last year. (改为否定句)
David ________ ________ Shanghai for London to further his study last year.
Teenagers should learn how they should take care of themselves. (改为简单句)
Teenagers should learn how for themselves.
Sandy has been in the Science Club since eight months ago. (对划线部分提问)
________ ________ has Sandy been in the Science Club?
Of all the tourist attractions, Martha likes the Great Wall best. (保持句意基本不变)
Martha likes the Great Wall ________ ________ any other tourist attraction.
Lily threw away the old coats because she thought they were out of date. (改为被动语态）
The old coats ________ _______ away by Lily because she thought they were out of date.
The little boy never has lunch at school.（改为反意疑问句）
The little boy never has lunch at school, _________ _________?
Will Karen take part in Lucy’s birthday party? Mr. Smith asked me. (改为宾语从句)
Mr. Smith asked me __________ Karen ________ take part in Lucy’s birthday party.
You'd better tell us about today's discussion． （改为否定句）
You'd better us about today's discussion．
The teachers are still taking about where they will hold the concert． （改为简单句）
The teachers are still talking about hold the concert．
It is fine weather to row a boat on the lake． （改为感叹句）
weather it is to row a boat on the lake!
I can't hear you well． Please say it louder． （保持句意基本不变）
Please say it louder I can hear you well．
The Bridge connecting Nantong to Zhangjiagang is 11，072 metres long． （对划线部分提问）
is the bridge connecting Nantong to Zhangjiagang？