句型转换。

1. It's time for after-school activities. (同义句)

    It's time ______ ______ after-school activities.

2. Millie is a good swimmer. (同义句)

    Millie is good ______ ______.

3. Do you want to go shopping this weekend? (同义句)

    ______ you ______ to go shopping this weekend?

4. My brother does his homework every day. (改否定句)

    My brother ______ ______ his homework every day.

5. My father is a doctor. My mother is a doctor, too. (合并成一句)

    My parents ______ ______ doctors.

海军北海舰队某潜艇基地是中国海军第一支核潜艇部队。基地官兵用热血书写忠诚，用生命践行使命，把勇担特殊使命、矢志精武强能转化为自觉行动，把面对生死抉择、不顾个人安危视为“精神核动力”，为维护国家主权、安全、发展作出了突出贡献，建立了不朽功勋。“你可以没有我，可中国不能没有核潜艇”。每次出海前，许多人都会悄悄地在“遗书”上写下这句话。对此，下列认识正确的是（  ）

①维护祖国的安全、荣誉和利益，是每个公民应尽的责任 

②维护国家利益，必然会牺牲个人利益 

③要服务社会，努力做一个负责任的公民

④要爱岗敬业，让自身价值在奉献中提升

A．①③④

B．②③④

C．①②③④

D．①②③