连词成句，注意标点符号。

l.his, here, is, photo, family, (.)  

________________________________________ .

2.your, the, for, of, thanks, photo, family, (.)  

________________________________________ .

3.your, is, brother, Paul, (?)  

________________________________________ ?

4.are, not, these, grandparents, his, (.)  

________________________________________ .

5.she, aunt, his, is, (?)

________________________________________ ?

重要的计算机系统的备用电源是（）。

A.柴油发电机组

B.不停电电源

C.稳频稳压式不停电电源