Rewrite these questions using the Passive.Leave out the doer

Rewrite these questions using the Passive.Leave out the doer of the acyion.
1.How many books can people take out of the library at any one time?
2.Who will they ask to dance first?
3.Is somenbody following us?
4.Was somebody feeding the animals when the elephant escaped?
5.Are we going to put the presents under the Christmas tree after dinner?
6.Had somebody driven this car before you paid for it?
7.How do you make spaghetti?
8.Have they eaten all the food?
像这种疑问句的、我就一直不明白!
被动语态的转换!