句型转换,根据所给的汉语提示,转换下列句型.

 1.  That some ads can be very useful is true. (改为同义句)

                   that some ads can be very useful.

2.  Soft lighting makes people look good.  (改为被动语态)

     People are made              good by soft lighting.

3.  I really don't know which one to buy.  (改为同义句)

     I really don't know which one I              ．

4.  The sick woman isn't strong enough to do the work.(改为同义句)

    The sick woman is       weak       do the work.

5.  People spend too much time eating their meals.  (改为同义句)

    It       people too much time       eat their meals.

福利国家型社会保障的理论依据是“（）”。

A、国家经济学；

B、福利经济学；

C、宏观经济学；

D、发展经济学。